AWS SDK for PHP 3.x

Client: Aws\ApplicationAutoScaling\ApplicationAutoScalingClient

Service ID: application-autoscaling

Version: 2016-02-06

This page describes the parameters and results for the operations of the Application Auto Scaling (2016-02-06), and shows how to use the Aws\ApplicationAutoScaling\ApplicationAutoScalingClient object to call the described operations. This documentation is specific to the 2016-02-06 API version of the service.

Operation Summary

Each of the following operations can be created from a client using $client->getCommand('CommandName'), where "CommandName" is the name of one of the following operations. Note: a command is a value that encapsulates an operation and the parameters used to create an HTTP request.

You can also create and send a command immediately using the magic methods available on a client object: $client->commandName(/* parameters */). You can send the command asynchronously (returning a promise) by appending the word "Async" to the operation name: $client->commandNameAsync(/* parameters */).

DeleteScalingPolicy ( array $params = [] )
Deletes the specified scaling policy for an Application Auto Scaling scalable target.
DeleteScheduledAction ( array $params = [] )
Deletes the specified scheduled action for an Application Auto Scaling scalable target.
DeregisterScalableTarget ( array $params = [] )
Deregisters an Application Auto Scaling scalable target when you have finished using it.
DescribeScalableTargets ( array $params = [] )
Gets information about the scalable targets in the specified namespace.
DescribeScalingActivities ( array $params = [] )
Provides descriptive information about the scaling activities in the specified namespace from the previous six weeks.
DescribeScalingPolicies ( array $params = [] )
Describes the Application Auto Scaling scaling policies for the specified service namespace.
DescribeScheduledActions ( array $params = [] )
Describes the Application Auto Scaling scheduled actions for the specified service namespace.
ListTagsForResource ( array $params = [] )
Returns all the tags on the specified Application Auto Scaling scalable target.
PutScalingPolicy ( array $params = [] )
Creates or updates a scaling policy for an Application Auto Scaling scalable target.
PutScheduledAction ( array $params = [] )
Creates or updates a scheduled action for an Application Auto Scaling scalable target.
RegisterScalableTarget ( array $params = [] )
Registers or updates a scalable target, which is the resource that you want to scale.
TagResource ( array $params = [] )
Adds or edits tags on an Application Auto Scaling scalable target.
UntagResource ( array $params = [] )
Deletes tags from an Application Auto Scaling scalable target.

Paginators

Paginators handle automatically iterating over paginated API results. Paginators are associated with specific API operations, and they accept the parameters that the corresponding API operation accepts. You can get a paginator from a client class using getPaginator($paginatorName, $operationParameters). This client supports the following paginators:

DescribeScalableTargets
DescribeScalingActivities
DescribeScalingPolicies
DescribeScheduledActions

Operations

DeleteScalingPolicy

$result = $client->deleteScalingPolicy([/* ... */]);
$promise = $client->deleteScalingPolicyAsync([/* ... */]);

Deletes the specified scaling policy for an Application Auto Scaling scalable target.

Deleting a step scaling policy deletes the underlying alarm action, but does not delete the CloudWatch alarm associated with the scaling policy, even if it no longer has an associated action.

For more information, see Delete a step scaling policy and Delete a target tracking scaling policy in the Application Auto Scaling User Guide.

Parameter Syntax

$result = $client->deleteScalingPolicy([
    'PolicyName' => '<string>', // REQUIRED
    'ResourceId' => '<string>', // REQUIRED
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount', // REQUIRED
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
]);

Parameter Details

Members

PolicyName

Required: Yes
Type: string

The name of the scaling policy.

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scalable target. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Required: Yes
Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Result Syntax

[]

Result Details

The results for this operation are always empty.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
ObjectNotFoundException:
The specified object could not be found. For any operation that depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any operation that deletes or deregisters a resource, this exception is thrown if the resource cannot be found.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To delete a scaling policy

This example deletes a scaling policy for the Amazon ECS service called web-app, which is running in the default cluster.

$result = $client->deleteScalingPolicy([
    'PolicyName' => 'web-app-cpu-lt-25',
    'ResourceId' => 'service/default/web-app',
    'ScalableDimension' => 'ecs:service:DesiredCount',
    'ServiceNamespace' => 'ecs',
]);

Result syntax:

[
]

DeleteScheduledAction

$result = $client->deleteScheduledAction([/* ... */]);
$promise = $client->deleteScheduledActionAsync([/* ... */]);

Deletes the specified scheduled action for an Application Auto Scaling scalable target.

For more information, see Delete a scheduled action in the Application Auto Scaling User Guide.

Parameter Syntax

$result = $client->deleteScheduledAction([
    'ResourceId' => '<string>', // REQUIRED
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount', // REQUIRED
    'ScheduledActionName' => '<string>', // REQUIRED
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
]);

Parameter Details

Members

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scheduled action. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Required: Yes
Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ScheduledActionName

Required: Yes
Type: string

The name of the scheduled action.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Result Syntax

[]

Result Details

The results for this operation are always empty.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
ObjectNotFoundException:
The specified object could not be found. For any operation that depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any operation that deletes or deregisters a resource, this exception is thrown if the resource cannot be found.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To delete a scheduled action

This example deletes a scheduled action for the AppStream 2.0 fleet called sample-fleet.

$result = $client->deleteScheduledAction([
    'ResourceId' => 'fleet/sample-fleet',
    'ScalableDimension' => 'appstream:fleet:DesiredCapacity',
    'ScheduledActionName' => 'my-recurring-action',
    'ServiceNamespace' => 'appstream',
]);

Result syntax:

[
]

DeregisterScalableTarget

$result = $client->deregisterScalableTarget([/* ... */]);
$promise = $client->deregisterScalableTargetAsync([/* ... */]);

Deregisters an Application Auto Scaling scalable target when you have finished using it. To see which resources have been registered, use DescribeScalableTargets.

Deregistering a scalable target deletes the scaling policies and the scheduled actions that are associated with it.

Parameter Syntax

$result = $client->deregisterScalableTarget([
    'ResourceId' => '<string>', // REQUIRED
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount', // REQUIRED
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
]);

Parameter Details

Members

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scalable target. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Required: Yes
Type: string

The scalable dimension associated with the scalable target. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Result Syntax

[]

Result Details

The results for this operation are always empty.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
ObjectNotFoundException:
The specified object could not be found. For any operation that depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any operation that deletes or deregisters a resource, this exception is thrown if the resource cannot be found.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To deregister a scalable target

This example deregisters a scalable target for an Amazon ECS service called web-app that is running in the default cluster.

$result = $client->deregisterScalableTarget([
    'ResourceId' => 'service/default/web-app',
    'ScalableDimension' => 'ecs:service:DesiredCount',
    'ServiceNamespace' => 'ecs',
]);

Result syntax:

[
]

DescribeScalableTargets

$result = $client->describeScalableTargets([/* ... */]);
$promise = $client->describeScalableTargetsAsync([/* ... */]);

Gets information about the scalable targets in the specified namespace.

You can filter the results using ResourceIds and ScalableDimension.

Parameter Syntax

$result = $client->describeScalableTargets([
    'MaxResults' => <integer>,
    'NextToken' => '<string>',
    'ResourceIds' => ['<string>', ...],
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
]);

Parameter Details

Members

MaxResults

Type: int

The maximum number of scalable targets. This value can be between 1 and 50. The default value is 50.

If this parameter is used, the operation returns up to MaxResults results at a time, along with a NextToken value. To get the next set of results, include the NextToken value in a subsequent call. If this parameter is not used, the operation returns up to 50 results and a NextToken value, if applicable.

NextToken

Type: string

The token for the next set of results.

ResourceIds

Type: Array of strings

The identifier of the resource associated with the scalable target. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Type: string

The scalable dimension associated with the scalable target. This string consists of the service namespace, resource type, and scaling property. If you specify a scalable dimension, you must also specify a resource ID.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Result Syntax

[
    'NextToken' => '<string>',
    'ScalableTargets' => [
        [
            'CreationTime' => <DateTime>,
            'MaxCapacity' => <integer>,
            'MinCapacity' => <integer>,
            'ResourceId' => '<string>',
            'RoleARN' => '<string>',
            'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
            'ScalableTargetARN' => '<string>',
            'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune',
            'SuspendedState' => [
                'DynamicScalingInSuspended' => true || false,
                'DynamicScalingOutSuspended' => true || false,
                'ScheduledScalingSuspended' => true || false,
            ],
        ],
        // ...
    ],
]

Result Details

Members

NextToken

Type: string

The token required to get the next set of results. This value is null if there are no more results to return.

ScalableTargets

Type: Array of ScalableTarget structures

The scalable targets that match the request parameters.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
InvalidNextTokenException:
The next token supplied was invalid.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To describe scalable targets

This example describes the scalable targets for the ECS service namespace.

$result = $client->describeScalableTargets([
    'ServiceNamespace' => 'ecs',
]);

Result syntax:

[
    'ScalableTargets' => [
        [
            'CreationTime' => ,
            'MaxCapacity' => 10,
            'MinCapacity' => 1,
            'ResourceId' => 'service/default/web-app',
            'RoleARN' => 'arn:aws:iam::012345678910:role/aws-service-role/ecs.application-autoscaling.amazonaws.com/AWSServiceRoleForApplicationAutoScaling_ECSService',
            'ScalableDimension' => 'ecs:service:DesiredCount',
            'ServiceNamespace' => 'ecs',
            'SuspendedState' => [
                'DynamicScalingInSuspended' => ,
                'DynamicScalingOutSuspended' => ,
                'ScheduledScalingSuspended' => ,
            ],
        ],
    ],
]

DescribeScalingActivities

$result = $client->describeScalingActivities([/* ... */]);
$promise = $client->describeScalingActivitiesAsync([/* ... */]);

Provides descriptive information about the scaling activities in the specified namespace from the previous six weeks.

You can filter the results using ResourceId and ScalableDimension.

For information about viewing scaling activities using the Amazon Web Services CLI, see Scaling activities for Application Auto Scaling.

Parameter Syntax

$result = $client->describeScalingActivities([
    'IncludeNotScaledActivities' => true || false,
    'MaxResults' => <integer>,
    'NextToken' => '<string>',
    'ResourceId' => '<string>',
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
]);

Parameter Details

Members

IncludeNotScaledActivities

Type: boolean

Specifies whether to include activities that aren't scaled (not scaled activities) in the response. Not scaled activities are activities that aren't completed or started for various reasons, such as preventing infinite scaling loops. For help interpreting the not scaled reason details in the response, see Scaling activities for Application Auto Scaling.

MaxResults

Type: int

The maximum number of scalable targets. This value can be between 1 and 50. The default value is 50.

NextToken

Type: string

The token for the next set of results.

ResourceId

Type: string

The identifier of the resource associated with the scaling activity. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property. If you specify a scalable dimension, you must also specify a resource ID.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Result Syntax

[
    'NextToken' => '<string>',
    'ScalingActivities' => [
        [
            'ActivityId' => '<string>',
            'Cause' => '<string>',
            'Description' => '<string>',
            'Details' => '<string>',
            'EndTime' => <DateTime>,
            'NotScaledReasons' => [
                [
                    'Code' => '<string>',
                    'CurrentCapacity' => <integer>,
                    'MaxCapacity' => <integer>,
                    'MinCapacity' => <integer>,
                ],
                // ...
            ],
            'ResourceId' => '<string>',
            'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
            'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune',
            'StartTime' => <DateTime>,
            'StatusCode' => 'Pending|InProgress|Successful|Overridden|Unfulfilled|Failed',
            'StatusMessage' => '<string>',
        ],
        // ...
    ],
]

Result Details

Members

NextToken

Type: string

The token required to get the next set of results. This value is null if there are no more results to return.

ScalingActivities

Type: Array of ScalingActivity structures

A list of scaling activity objects.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
InvalidNextTokenException:
The next token supplied was invalid.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To describe scaling activities for a scalable target

This example describes the scaling activities for an Amazon ECS service called web-app that is running in the default cluster.

$result = $client->describeScalingActivities([
    'ResourceId' => 'service/default/web-app',
    'ScalableDimension' => 'ecs:service:DesiredCount',
    'ServiceNamespace' => 'ecs',
]);

Result syntax:

[
    'ScalingActivities' => [
        [
            'ActivityId' => 'e6c5f7d1-dbbb-4a3f-89b2-51f33e766399',
            'Cause' => 'monitor alarm web-app-cpu-lt-25 in state ALARM triggered policy web-app-cpu-lt-25',
            'Description' => 'Setting desired count to 1.',
            'EndTime' => ,
            'ResourceId' => 'service/default/web-app',
            'ScalableDimension' => 'ecs:service:DesiredCount',
            'ServiceNamespace' => 'ecs',
            'StartTime' => ,
            'StatusCode' => 'Successful',
            'StatusMessage' => 'Successfully set desired count to 1. Change successfully fulfilled by ecs.',
        ],
    ],
]

DescribeScalingPolicies

$result = $client->describeScalingPolicies([/* ... */]);
$promise = $client->describeScalingPoliciesAsync([/* ... */]);

Describes the Application Auto Scaling scaling policies for the specified service namespace.

You can filter the results using ResourceId, ScalableDimension, and PolicyNames.

For more information, see Target tracking scaling policies and Step scaling policies in the Application Auto Scaling User Guide.

Parameter Syntax

$result = $client->describeScalingPolicies([
    'MaxResults' => <integer>,
    'NextToken' => '<string>',
    'PolicyNames' => ['<string>', ...],
    'ResourceId' => '<string>',
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
]);

Parameter Details

Members

MaxResults

Type: int

The maximum number of scalable targets. This value can be between 1 and 10. The default value is 10.

NextToken

Type: string

The token for the next set of results.

PolicyNames

Type: Array of strings

The names of the scaling policies to describe.

ResourceId

Type: string

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property. If you specify a scalable dimension, you must also specify a resource ID.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Result Syntax

[
    'NextToken' => '<string>',
    'ScalingPolicies' => [
        [
            'Alarms' => [
                [
                    'AlarmARN' => '<string>',
                    'AlarmName' => '<string>',
                ],
                // ...
            ],
            'CreationTime' => <DateTime>,
            'PolicyARN' => '<string>',
            'PolicyName' => '<string>',
            'PolicyType' => 'StepScaling|TargetTrackingScaling',
            'ResourceId' => '<string>',
            'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
            'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune',
            'StepScalingPolicyConfiguration' => [
                'AdjustmentType' => 'ChangeInCapacity|PercentChangeInCapacity|ExactCapacity',
                'Cooldown' => <integer>,
                'MetricAggregationType' => 'Average|Minimum|Maximum',
                'MinAdjustmentMagnitude' => <integer>,
                'StepAdjustments' => [
                    [
                        'MetricIntervalLowerBound' => <float>,
                        'MetricIntervalUpperBound' => <float>,
                        'ScalingAdjustment' => <integer>,
                    ],
                    // ...
                ],
            ],
            'TargetTrackingScalingPolicyConfiguration' => [
                'CustomizedMetricSpecification' => [
                    'Dimensions' => [
                        [
                            'Name' => '<string>',
                            'Value' => '<string>',
                        ],
                        // ...
                    ],
                    'MetricName' => '<string>',
                    'Metrics' => [
                        [
                            'Expression' => '<string>',
                            'Id' => '<string>',
                            'Label' => '<string>',
                            'MetricStat' => [
                                'Metric' => [
                                    'Dimensions' => [
                                        [
                                            'Name' => '<string>',
                                            'Value' => '<string>',
                                        ],
                                        // ...
                                    ],
                                    'MetricName' => '<string>',
                                    'Namespace' => '<string>',
                                ],
                                'Stat' => '<string>',
                                'Unit' => '<string>',
                            ],
                            'ReturnData' => true || false,
                        ],
                        // ...
                    ],
                    'Namespace' => '<string>',
                    'Statistic' => 'Average|Minimum|Maximum|SampleCount|Sum',
                    'Unit' => '<string>',
                ],
                'DisableScaleIn' => true || false,
                'PredefinedMetricSpecification' => [
                    'PredefinedMetricType' => 'DynamoDBReadCapacityUtilization|DynamoDBWriteCapacityUtilization|ALBRequestCountPerTarget|RDSReaderAverageCPUUtilization|RDSReaderAverageDatabaseConnections|EC2SpotFleetRequestAverageCPUUtilization|EC2SpotFleetRequestAverageNetworkIn|EC2SpotFleetRequestAverageNetworkOut|SageMakerVariantInvocationsPerInstance|ECSServiceAverageCPUUtilization|ECSServiceAverageMemoryUtilization|AppStreamAverageCapacityUtilization|ComprehendInferenceUtilization|LambdaProvisionedConcurrencyUtilization|CassandraReadCapacityUtilization|CassandraWriteCapacityUtilization|KafkaBrokerStorageUtilization|ElastiCachePrimaryEngineCPUUtilization|ElastiCacheReplicaEngineCPUUtilization|ElastiCacheDatabaseMemoryUsageCountedForEvictPercentage|NeptuneReaderAverageCPUUtilization',
                    'ResourceLabel' => '<string>',
                ],
                'ScaleInCooldown' => <integer>,
                'ScaleOutCooldown' => <integer>,
                'TargetValue' => <float>,
            ],
        ],
        // ...
    ],
]

Result Details

Members

NextToken

Type: string

The token required to get the next set of results. This value is null if there are no more results to return.

ScalingPolicies

Type: Array of ScalingPolicy structures

Information about the scaling policies.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
FailedResourceAccessException:
Failed access to resources caused an exception. This exception is thrown when Application Auto Scaling is unable to retrieve the alarms associated with a scaling policy due to a client error, for example, if the role ARN specified for a scalable target does not have permission to call the CloudWatch DescribeAlarms on your behalf.
InvalidNextTokenException:
The next token supplied was invalid.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To describe scaling policies

This example describes the scaling policies for the ECS service namespace.

$result = $client->describeScalingPolicies([
    'ServiceNamespace' => 'ecs',
]);

Result syntax:

[
    'NextToken' => '',
    'ScalingPolicies' => [
        [
            'Alarms' => [
                [
                    'AlarmARN' => 'arn:aws:cloudwatch:us-west-2:012345678910:alarm:web-app-cpu-gt-75',
                    'AlarmName' => 'web-app-cpu-gt-75',
                ],
            ],
            'CreationTime' => ,
            'PolicyARN' => 'arn:aws:autoscaling:us-west-2:012345678910:scalingPolicy:6d8972f3-efc8-437c-92d1-6270f29a66e7:resource/ecs/service/default/web-app:policyName/web-app-cpu-gt-75',
            'PolicyName' => 'web-app-cpu-gt-75',
            'PolicyType' => 'StepScaling',
            'ResourceId' => 'service/default/web-app',
            'ScalableDimension' => 'ecs:service:DesiredCount',
            'ServiceNamespace' => 'ecs',
            'StepScalingPolicyConfiguration' => [
                'AdjustmentType' => 'PercentChangeInCapacity',
                'Cooldown' => 60,
                'StepAdjustments' => [
                    [
                        'MetricIntervalLowerBound' => 0,
                        'ScalingAdjustment' => 200,
                    ],
                ],
            ],
        ],
    ],
]

DescribeScheduledActions

$result = $client->describeScheduledActions([/* ... */]);
$promise = $client->describeScheduledActionsAsync([/* ... */]);

Describes the Application Auto Scaling scheduled actions for the specified service namespace.

You can filter the results using the ResourceId, ScalableDimension, and ScheduledActionNames parameters.

For more information, see Scheduled scaling and Managing scheduled scaling in the Application Auto Scaling User Guide.

Parameter Syntax

$result = $client->describeScheduledActions([
    'MaxResults' => <integer>,
    'NextToken' => '<string>',
    'ResourceId' => '<string>',
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
    'ScheduledActionNames' => ['<string>', ...],
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
]);

Parameter Details

Members

MaxResults

Type: int

The maximum number of scheduled action results. This value can be between 1 and 50. The default value is 50.

NextToken

Type: string

The token for the next set of results.

ResourceId

Type: string

The identifier of the resource associated with the scheduled action. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property. If you specify a scalable dimension, you must also specify a resource ID.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ScheduledActionNames

Type: Array of strings

The names of the scheduled actions to describe.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Result Syntax

[
    'NextToken' => '<string>',
    'ScheduledActions' => [
        [
            'CreationTime' => <DateTime>,
            'EndTime' => <DateTime>,
            'ResourceId' => '<string>',
            'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount',
            'ScalableTargetAction' => [
                'MaxCapacity' => <integer>,
                'MinCapacity' => <integer>,
            ],
            'Schedule' => '<string>',
            'ScheduledActionARN' => '<string>',
            'ScheduledActionName' => '<string>',
            'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune',
            'StartTime' => <DateTime>,
            'Timezone' => '<string>',
        ],
        // ...
    ],
]

Result Details

Members

NextToken

Type: string

The token required to get the next set of results. This value is null if there are no more results to return.

ScheduledActions

Type: Array of ScheduledAction structures

Information about the scheduled actions.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
InvalidNextTokenException:
The next token supplied was invalid.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To describe scheduled actions

This example describes the scheduled actions for the dynamodb service namespace.

$result = $client->describeScheduledActions([
    'ServiceNamespace' => 'dynamodb',
]);

Result syntax:

[
    'ScheduledActions' => [
        [
            'CreationTime' => ,
            'ResourceId' => 'table/my-table',
            'ScalableDimension' => 'dynamodb:table:WriteCapacityUnits',
            'ScalableTargetAction' => [
                'MaxCapacity' => 20,
                'MinCapacity' => 15,
            ],
            'Schedule' => 'at(2019-05-20T18:35:00)',
            'ScheduledActionARN' => 'arn:aws:autoscaling:us-west-2:123456789012:scheduledAction:2d36aa3b-cdf9-4565-b290-81db519b227d:resource/dynamodb/table/my-table:scheduledActionName/my-first-scheduled-action',
            'ScheduledActionName' => 'my-first-scheduled-action',
            'ServiceNamespace' => 'dynamodb',
        ],
        [
            'CreationTime' => ,
            'ResourceId' => 'table/my-table',
            'ScalableDimension' => 'dynamodb:table:WriteCapacityUnits',
            'ScalableTargetAction' => [
                'MaxCapacity' => 10,
                'MinCapacity' => 5,
            ],
            'Schedule' => 'at(2019-05-20T18:40:00)',
            'ScheduledActionARN' => 'arn:aws:autoscaling:us-west-2:123456789012:scheduledAction:2d36aa3b-cdf9-4565-b290-81db519b227d:resource/dynamodb/table/my-table:scheduledActionName/my-second-scheduled-action',
            'ScheduledActionName' => 'my-second-scheduled-action',
            'ServiceNamespace' => 'dynamodb',
        ],
    ],
]

ListTagsForResource

$result = $client->listTagsForResource([/* ... */]);
$promise = $client->listTagsForResourceAsync([/* ... */]);

Returns all the tags on the specified Application Auto Scaling scalable target.

For general information about tags, including the format and syntax, see Tagging Amazon Web Services resources in the Amazon Web Services General Reference.

Parameter Syntax

$result = $client->listTagsForResource([
    'ResourceARN' => '<string>', // REQUIRED
]);

Parameter Details

Members

ResourceARN

Required: Yes
Type: string

Specify the ARN of the scalable target.

For example: arn:aws:application-autoscaling:us-east-1:123456789012:scalable-target/1234abcd56ab78cd901ef1234567890ab123

To get the ARN for a scalable target, use DescribeScalableTargets.

Result Syntax

[
    'Tags' => ['<string>', ...],
]

Result Details

Members

Tags

Type: Associative array of custom strings keys (TagKey) to strings

A list of tags. Each tag consists of a tag key and a tag value.

Errors

ResourceNotFoundException:
The specified resource doesn't exist.

Examples

Example 1: To list tags for a scalable target

This example lists the tag key names and values that are attached to the scalable target specified by its ARN.

$result = $client->listTagsForResource([
    'ResourceARN' => 'arn:aws:application-autoscaling:us-west-2:123456789012:scalable-target/1234abcd56ab78cd901ef1234567890ab123',
]);

Result syntax:

[
    'Tags' => [
        'environment' => 'production',
    ],
]

PutScalingPolicy

$result = $client->putScalingPolicy([/* ... */]);
$promise = $client->putScalingPolicyAsync([/* ... */]);

Creates or updates a scaling policy for an Application Auto Scaling scalable target.

Each scalable target is identified by a service namespace, resource ID, and scalable dimension. A scaling policy applies to the scalable target identified by those three attributes. You cannot create a scaling policy until you have registered the resource as a scalable target.

Multiple scaling policies can be in force at the same time for the same scalable target. You can have one or more target tracking scaling policies, one or more step scaling policies, or both. However, there is a chance that multiple policies could conflict, instructing the scalable target to scale out or in at the same time. Application Auto Scaling gives precedence to the policy that provides the largest capacity for both scale out and scale in. For example, if one policy increases capacity by 3, another policy increases capacity by 200 percent, and the current capacity is 10, Application Auto Scaling uses the policy with the highest calculated capacity (200% of 10 = 20) and scales out to 30.

We recommend caution, however, when using target tracking scaling policies with step scaling policies because conflicts between these policies can cause undesirable behavior. For example, if the step scaling policy initiates a scale-in activity before the target tracking policy is ready to scale in, the scale-in activity will not be blocked. After the scale-in activity completes, the target tracking policy could instruct the scalable target to scale out again.

For more information, see Target tracking scaling policies and Step scaling policies in the Application Auto Scaling User Guide.

If a scalable target is deregistered, the scalable target is no longer available to use scaling policies. Any scaling policies that were specified for the scalable target are deleted.

Parameter Syntax

$result = $client->putScalingPolicy([
    'PolicyName' => '<string>', // REQUIRED
    'PolicyType' => 'StepScaling|TargetTrackingScaling',
    'ResourceId' => '<string>', // REQUIRED
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount', // REQUIRED
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
    'StepScalingPolicyConfiguration' => [
        'AdjustmentType' => 'ChangeInCapacity|PercentChangeInCapacity|ExactCapacity',
        'Cooldown' => <integer>,
        'MetricAggregationType' => 'Average|Minimum|Maximum',
        'MinAdjustmentMagnitude' => <integer>,
        'StepAdjustments' => [
            [
                'MetricIntervalLowerBound' => <float>,
                'MetricIntervalUpperBound' => <float>,
                'ScalingAdjustment' => <integer>, // REQUIRED
            ],
            // ...
        ],
    ],
    'TargetTrackingScalingPolicyConfiguration' => [
        'CustomizedMetricSpecification' => [
            'Dimensions' => [
                [
                    'Name' => '<string>', // REQUIRED
                    'Value' => '<string>', // REQUIRED
                ],
                // ...
            ],
            'MetricName' => '<string>',
            'Metrics' => [
                [
                    'Expression' => '<string>',
                    'Id' => '<string>', // REQUIRED
                    'Label' => '<string>',
                    'MetricStat' => [
                        'Metric' => [ // REQUIRED
                            'Dimensions' => [
                                [
                                    'Name' => '<string>', // REQUIRED
                                    'Value' => '<string>', // REQUIRED
                                ],
                                // ...
                            ],
                            'MetricName' => '<string>',
                            'Namespace' => '<string>',
                        ],
                        'Stat' => '<string>', // REQUIRED
                        'Unit' => '<string>',
                    ],
                    'ReturnData' => true || false,
                ],
                // ...
            ],
            'Namespace' => '<string>',
            'Statistic' => 'Average|Minimum|Maximum|SampleCount|Sum',
            'Unit' => '<string>',
        ],
        'DisableScaleIn' => true || false,
        'PredefinedMetricSpecification' => [
            'PredefinedMetricType' => 'DynamoDBReadCapacityUtilization|DynamoDBWriteCapacityUtilization|ALBRequestCountPerTarget|RDSReaderAverageCPUUtilization|RDSReaderAverageDatabaseConnections|EC2SpotFleetRequestAverageCPUUtilization|EC2SpotFleetRequestAverageNetworkIn|EC2SpotFleetRequestAverageNetworkOut|SageMakerVariantInvocationsPerInstance|ECSServiceAverageCPUUtilization|ECSServiceAverageMemoryUtilization|AppStreamAverageCapacityUtilization|ComprehendInferenceUtilization|LambdaProvisionedConcurrencyUtilization|CassandraReadCapacityUtilization|CassandraWriteCapacityUtilization|KafkaBrokerStorageUtilization|ElastiCachePrimaryEngineCPUUtilization|ElastiCacheReplicaEngineCPUUtilization|ElastiCacheDatabaseMemoryUsageCountedForEvictPercentage|NeptuneReaderAverageCPUUtilization', // REQUIRED
            'ResourceLabel' => '<string>',
        ],
        'ScaleInCooldown' => <integer>,
        'ScaleOutCooldown' => <integer>,
        'TargetValue' => <float>, // REQUIRED
    ],
]);

Parameter Details

Members

PolicyName

Required: Yes
Type: string

The name of the scaling policy.

You cannot change the name of a scaling policy, but you can delete the original scaling policy and create a new scaling policy with the same settings and a different name.

PolicyType

Type: string

The scaling policy type. This parameter is required if you are creating a scaling policy.

The following policy types are supported:

TargetTrackingScaling—Not supported for Amazon EMR

StepScaling—Not supported for DynamoDB, Amazon Comprehend, Lambda, Amazon Keyspaces, Amazon MSK, Amazon ElastiCache, or Neptune.

For more information, see Target tracking scaling policies and Step scaling policies in the Application Auto Scaling User Guide.

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Required: Yes
Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

StepScalingPolicyConfiguration

Type: StepScalingPolicyConfiguration structure

A step scaling policy.

This parameter is required if you are creating a policy and the policy type is StepScaling.

TargetTrackingScalingPolicyConfiguration

Type: TargetTrackingScalingPolicyConfiguration structure

A target tracking scaling policy. Includes support for predefined or customized metrics.

This parameter is required if you are creating a policy and the policy type is TargetTrackingScaling.

Result Syntax

[
    'Alarms' => [
        [
            'AlarmARN' => '<string>',
            'AlarmName' => '<string>',
        ],
        // ...
    ],
    'PolicyARN' => '<string>',
]

Result Details

Members

Alarms

Type: Array of Alarm structures

The CloudWatch alarms created for the target tracking scaling policy.

PolicyARN

Required: Yes
Type: string

The Amazon Resource Name (ARN) of the resulting scaling policy.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
LimitExceededException:
A per-account resource limit is exceeded. For more information, see Application Auto Scaling service quotas.
ObjectNotFoundException:
The specified object could not be found. For any operation that depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any operation that deletes or deregisters a resource, this exception is thrown if the resource cannot be found.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
FailedResourceAccessException:
Failed access to resources caused an exception. This exception is thrown when Application Auto Scaling is unable to retrieve the alarms associated with a scaling policy due to a client error, for example, if the role ARN specified for a scalable target does not have permission to call the CloudWatch DescribeAlarms on your behalf.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To apply a target tracking scaling policy with a predefined metric specification

The following example applies a target tracking scaling policy with a predefined metric specification to an Amazon ECS service called web-app in the default cluster. The policy keeps the average CPU utilization of the service at 75 percent, with scale-out and scale-in cooldown periods of 60 seconds.

$result = $client->putScalingPolicy([
    'PolicyName' => 'cpu75-target-tracking-scaling-policy',
    'PolicyType' => 'TargetTrackingScaling',
    'ResourceId' => 'service/default/web-app',
    'ScalableDimension' => 'ecs:service:DesiredCount',
    'ServiceNamespace' => 'ecs',
    'TargetTrackingScalingPolicyConfiguration' => [
        'PredefinedMetricSpecification' => [
            'PredefinedMetricType' => 'ECSServiceAverageCPUUtilization',
        ],
        'ScaleInCooldown' => 60,
        'ScaleOutCooldown' => 60,
        'TargetValue' => 75,
    ],
]);

Result syntax:

[
    'Alarms' => [
        [
            'AlarmARN' => 'arn:aws:cloudwatch:us-west-2:012345678910:alarm:TargetTracking-service/default/web-app-AlarmHigh-d4f0770c-b46e-434a-a60f-3b36d653feca',
            'AlarmName' => 'TargetTracking-service/default/web-app-AlarmHigh-d4f0770c-b46e-434a-a60f-3b36d653feca',
        ],
        [
            'AlarmARN' => 'arn:aws:cloudwatch:us-west-2:012345678910:alarm:TargetTracking-service/default/web-app-AlarmLow-1b437334-d19b-4a63-a812-6c67aaf2910d',
            'AlarmName' => 'TargetTracking-service/default/web-app-AlarmLow-1b437334-d19b-4a63-a812-6c67aaf2910d',
        ],
    ],
    'PolicyARN' => 'arn:aws:autoscaling:us-west-2:012345678910:scalingPolicy:6d8972f3-efc8-437c-92d1-6270f29a66e7:resource/ecs/service/default/web-app:policyName/cpu75-target-tracking-scaling-policy',
]

PutScheduledAction

$result = $client->putScheduledAction([/* ... */]);
$promise = $client->putScheduledActionAsync([/* ... */]);

Creates or updates a scheduled action for an Application Auto Scaling scalable target.

Each scalable target is identified by a service namespace, resource ID, and scalable dimension. A scheduled action applies to the scalable target identified by those three attributes. You cannot create a scheduled action until you have registered the resource as a scalable target.

When you specify start and end times with a recurring schedule using a cron expression or rates, they form the boundaries for when the recurring action starts and stops.

To update a scheduled action, specify the parameters that you want to change. If you don't specify start and end times, the old values are deleted.

For more information, see Scheduled scaling in the Application Auto Scaling User Guide.

If a scalable target is deregistered, the scalable target is no longer available to run scheduled actions. Any scheduled actions that were specified for the scalable target are deleted.

Parameter Syntax

$result = $client->putScheduledAction([
    'EndTime' => <integer || string || DateTime>,
    'ResourceId' => '<string>', // REQUIRED
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount', // REQUIRED
    'ScalableTargetAction' => [
        'MaxCapacity' => <integer>,
        'MinCapacity' => <integer>,
    ],
    'Schedule' => '<string>',
    'ScheduledActionName' => '<string>', // REQUIRED
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
    'StartTime' => <integer || string || DateTime>,
    'Timezone' => '<string>',
]);

Parameter Details

Members

EndTime

Type: timestamp (string|DateTime or anything parsable by strtotime)

The date and time for the recurring schedule to end, in UTC.

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scheduled action. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Required: Yes
Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ScalableTargetAction

Type: ScalableTargetAction structure

The new minimum and maximum capacity. You can set both values or just one. At the scheduled time, if the current capacity is below the minimum capacity, Application Auto Scaling scales out to the minimum capacity. If the current capacity is above the maximum capacity, Application Auto Scaling scales in to the maximum capacity.

Schedule

Type: string

The schedule for this action. The following formats are supported:

At expressions - "at(yyyy-mm-ddThh:mm:ss)"
Rate expressions - "rate(value unit)"
Cron expressions - "cron(fields)"

At expressions are useful for one-time schedules. Cron expressions are useful for scheduled actions that run periodically at a specified date and time, and rate expressions are useful for scheduled actions that run at a regular interval.

At and cron expressions use Universal Coordinated Time (UTC) by default.

The cron format consists of six fields separated by white spaces: [Minutes] [Hours] [Day_of_Month] [Month] [Day_of_Week] [Year].

For more information and examples, see Example scheduled actions for Application Auto Scaling in the Application Auto Scaling User Guide.

ScheduledActionName

Required: Yes
Type: string

The name of the scheduled action. This name must be unique among all other scheduled actions on the specified scalable target.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

StartTime

Type: timestamp (string|DateTime or anything parsable by strtotime)

The date and time for this scheduled action to start, in UTC.

Timezone

Type: string

Specifies the time zone used when setting a scheduled action by using an at or cron expression. If a time zone is not provided, UTC is used by default.

Valid values are the canonical names of the IANA time zones supported by Joda-Time (such as Etc/GMT+9 or Pacific/Tahiti). For more information, see https://www.joda.org/joda-time/timezones.html.

Result Syntax

[]

Result Details

The results for this operation are always empty.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
LimitExceededException:
A per-account resource limit is exceeded. For more information, see Application Auto Scaling service quotas.
ObjectNotFoundException:
The specified object could not be found. For any operation that depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any operation that deletes or deregisters a resource, this exception is thrown if the resource cannot be found.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To create a recurring scheduled action

This example adds a scheduled action to a DynamoDB table called TestTable to scale out on a recurring schedule. On the specified schedule (every day at 12:15pm UTC), if the current capacity is below the value specified for MinCapacity, Application Auto Scaling scales out to the value specified by MinCapacity.

$result = $client->putScheduledAction([
    'ResourceId' => 'table/TestTable',
    'ScalableDimension' => 'dynamodb:table:WriteCapacityUnits',
    'ScalableTargetAction' => [
        'MinCapacity' => 6,
    ],
    'Schedule' => 'cron(15 12 * * ? *)',
    'ScheduledActionName' => 'my-recurring-action',
    'ServiceNamespace' => 'dynamodb',
]);

Result syntax:

[
]

RegisterScalableTarget

$result = $client->registerScalableTarget([/* ... */]);
$promise = $client->registerScalableTargetAsync([/* ... */]);

Registers or updates a scalable target, which is the resource that you want to scale.

Scalable targets are uniquely identified by the combination of resource ID, scalable dimension, and namespace, which represents some capacity dimension of the underlying service.

When you register a new scalable target, you must specify values for the minimum and maximum capacity. If the specified resource is not active in the target service, this operation does not change the resource's current capacity. Otherwise, it changes the resource's current capacity to a value that is inside of this range.

If you add a scaling policy, current capacity is adjustable within the specified range when scaling starts. Application Auto Scaling scaling policies will not scale capacity to values that are outside of the minimum and maximum range.

After you register a scalable target, you do not need to register it again to use other Application Auto Scaling operations. To see which resources have been registered, use DescribeScalableTargets. You can also view the scaling policies for a service namespace by using DescribeScalableTargets. If you no longer need a scalable target, you can deregister it by using DeregisterScalableTarget.

To update a scalable target, specify the parameters that you want to change. Include the parameters that identify the scalable target: resource ID, scalable dimension, and namespace. Any parameters that you don't specify are not changed by this update request.

If you call the RegisterScalableTarget API operation to create a scalable target, there might be a brief delay until the operation achieves eventual consistency. You might become aware of this brief delay if you get unexpected errors when performing sequential operations. The typical strategy is to retry the request, and some Amazon Web Services SDKs include automatic backoff and retry logic.

If you call the RegisterScalableTarget API operation to update an existing scalable target, Application Auto Scaling retrieves the current capacity of the resource. If it's below the minimum capacity or above the maximum capacity, Application Auto Scaling adjusts the capacity of the scalable target to place it within these bounds, even if you don't include the MinCapacity or MaxCapacity request parameters.

Parameter Syntax

$result = $client->registerScalableTarget([
    'MaxCapacity' => <integer>,
    'MinCapacity' => <integer>,
    'ResourceId' => '<string>', // REQUIRED
    'RoleARN' => '<string>',
    'ScalableDimension' => 'ecs:service:DesiredCount|ec2:spot-fleet-request:TargetCapacity|elasticmapreduce:instancegroup:InstanceCount|appstream:fleet:DesiredCapacity|dynamodb:table:ReadCapacityUnits|dynamodb:table:WriteCapacityUnits|dynamodb:index:ReadCapacityUnits|dynamodb:index:WriteCapacityUnits|rds:cluster:ReadReplicaCount|sagemaker:variant:DesiredInstanceCount|custom-resource:ResourceType:Property|comprehend:document-classifier-endpoint:DesiredInferenceUnits|comprehend:entity-recognizer-endpoint:DesiredInferenceUnits|lambda:function:ProvisionedConcurrency|cassandra:table:ReadCapacityUnits|cassandra:table:WriteCapacityUnits|kafka:broker-storage:VolumeSize|elasticache:replication-group:NodeGroups|elasticache:replication-group:Replicas|neptune:cluster:ReadReplicaCount', // REQUIRED
    'ServiceNamespace' => 'ecs|elasticmapreduce|ec2|appstream|dynamodb|rds|sagemaker|custom-resource|comprehend|lambda|cassandra|kafka|elasticache|neptune', // REQUIRED
    'SuspendedState' => [
        'DynamicScalingInSuspended' => true || false,
        'DynamicScalingOutSuspended' => true || false,
        'ScheduledScalingSuspended' => true || false,
    ],
    'Tags' => ['<string>', ...],
]);

Parameter Details

Members

MaxCapacity

Type: int

The maximum value that you plan to scale out to. When a scaling policy is in effect, Application Auto Scaling can scale out (expand) as needed to the maximum capacity limit in response to changing demand. This property is required when registering a new scalable target.

Although you can specify a large maximum capacity, note that service quotas might impose lower limits. Each service has its own default quotas for the maximum capacity of the resource. If you want to specify a higher limit, you can request an increase. For more information, consult the documentation for that service. For information about the default quotas for each service, see Service endpoints and quotas in the Amazon Web Services General Reference.

MinCapacity

Type: int

The minimum value that you plan to scale in to. When a scaling policy is in effect, Application Auto Scaling can scale in (contract) as needed to the minimum capacity limit in response to changing demand. This property is required when registering a new scalable target.

For the following resources, the minimum value allowed is 0.

AppStream 2.0 fleets
Aurora DB clusters
ECS services
EMR clusters
Lambda provisioned concurrency
SageMaker endpoint variants
Spot Fleets
custom resources

It's strongly recommended that you specify a value greater than 0. A value greater than 0 means that data points are continuously reported to CloudWatch that scaling policies can use to scale on a metric like average CPU utilization.

For all other resources, the minimum allowed value depends on the type of resource that you are using. If you provide a value that is lower than what a resource can accept, an error occurs. In which case, the error message will provide the minimum value that the resource can accept.

ResourceId

Required: Yes
Type: string

The identifier of the resource that is associated with the scalable target. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

RoleARN

Type: string

This parameter is required for services that do not support service-linked roles (such as Amazon EMR), and it must specify the ARN of an IAM role that allows Application Auto Scaling to modify the scalable target on your behalf.

If the service supports service-linked roles, Application Auto Scaling uses a service-linked role, which it creates if it does not yet exist. For more information, see Application Auto Scaling IAM roles.

ScalableDimension

Required: Yes
Type: string

The scalable dimension associated with the scalable target. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

SuspendedState

Type: SuspendedState structure

An embedded object that contains attributes and attribute values that are used to suspend and resume automatic scaling. Setting the value of an attribute to true suspends the specified scaling activities. Setting it to false (default) resumes the specified scaling activities.

Suspension Outcomes

For DynamicScalingInSuspended, while a suspension is in effect, all scale-in activities that are triggered by a scaling policy are suspended.
For DynamicScalingOutSuspended, while a suspension is in effect, all scale-out activities that are triggered by a scaling policy are suspended.
For ScheduledScalingSuspended, while a suspension is in effect, all scaling activities that involve scheduled actions are suspended.

For more information, see Suspending and resuming scaling in the Application Auto Scaling User Guide.

Tags

Type: Associative array of custom strings keys (TagKey) to strings

Assigns one or more tags to the scalable target. Use this parameter to tag the scalable target when it is created. To tag an existing scalable target, use the TagResource operation.

Each tag consists of a tag key and a tag value. Both the tag key and the tag value are required. You cannot have more than one tag on a scalable target with the same tag key.

Use tags to control access to a scalable target. For more information, see Tagging support for Application Auto Scaling in the Application Auto Scaling User Guide.

Result Syntax

[
    'ScalableTargetARN' => '<string>',
]

Result Details

Members

ScalableTargetARN

Type: string

The ARN of the scalable target.

Errors

ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.
LimitExceededException:
A per-account resource limit is exceeded. For more information, see Application Auto Scaling service quotas.
ConcurrentUpdateException:
Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.
InternalServiceException:
The service encountered an internal error.

Examples

Example 1: To register an ECS service as a scalable target

This example registers a scalable target from an Amazon ECS service called web-app that is running on the default cluster, with a minimum desired count of 1 task and a maximum desired count of 10 tasks.

$result = $client->registerScalableTarget([
    'MaxCapacity' => 10,
    'MinCapacity' => 1,
    'ResourceId' => 'service/default/web-app',
    'ScalableDimension' => 'ecs:service:DesiredCount',
    'ServiceNamespace' => 'ecs',
]);

TagResource

$result = $client->tagResource([/* ... */]);
$promise = $client->tagResourceAsync([/* ... */]);

Adds or edits tags on an Application Auto Scaling scalable target.

Each tag consists of a tag key and a tag value, which are both case-sensitive strings. To add a tag, specify a new tag key and a tag value. To edit a tag, specify an existing tag key and a new tag value.

You can use this operation to tag an Application Auto Scaling scalable target, but you cannot tag a scaling policy or scheduled action.

You can also add tags to an Application Auto Scaling scalable target while creating it (RegisterScalableTarget).

For general information about tags, including the format and syntax, see Tagging Amazon Web Services resources in the Amazon Web Services General Reference.

Use tags to control access to a scalable target. For more information, see Tagging support for Application Auto Scaling in the Application Auto Scaling User Guide.

Parameter Syntax

$result = $client->tagResource([
    'ResourceARN' => '<string>', // REQUIRED
    'Tags' => ['<string>', ...], // REQUIRED
]);

Parameter Details

Members

ResourceARN

Required: Yes
Type: string

Identifies the Application Auto Scaling scalable target that you want to apply tags to.

For example: arn:aws:application-autoscaling:us-east-1:123456789012:scalable-target/1234abcd56ab78cd901ef1234567890ab123

To get the ARN for a scalable target, use DescribeScalableTargets.

Tags

Required: Yes
Type: Associative array of custom strings keys (TagKey) to strings

The tags assigned to the resource. A tag is a label that you assign to an AWS resource.

Each tag consists of a tag key and a tag value.

You cannot have more than one tag on an Application Auto Scaling scalable target with the same tag key. If you specify an existing tag key with a different tag value, Application Auto Scaling replaces the current tag value with the specified one.

For information about the rules that apply to tag keys and tag values, see User-defined tag restrictions in the Amazon Web Services Billing and Cost Management User Guide.

Result Syntax

[]

Result Details

The results for this operation are always empty.

Errors

ResourceNotFoundException:
The specified resource doesn't exist.
TooManyTagsException:
The request contains too many tags. Try the request again with fewer tags.
ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.

Examples

Example 1: To add a tag to a scalable target

This example adds a tag with the key name "environment" and the value "production" to the scalable target specified by its ARN.

$result = $client->tagResource([
    'ResourceARN' => 'arn:aws:application-autoscaling:us-west-2:123456789012:scalable-target/1234abcd56ab78cd901ef1234567890ab123',
    'Tags' => [
        'environment' => 'production',
    ],
]);

Result syntax:

[
]

UntagResource

$result = $client->untagResource([/* ... */]);
$promise = $client->untagResourceAsync([/* ... */]);

Deletes tags from an Application Auto Scaling scalable target. To delete a tag, specify the tag key and the Application Auto Scaling scalable target.

Parameter Syntax

$result = $client->untagResource([
    'ResourceARN' => '<string>', // REQUIRED
    'TagKeys' => ['<string>', ...], // REQUIRED
]);

Parameter Details

Members

ResourceARN

Required: Yes
Type: string

Identifies the Application Auto Scaling scalable target from which to remove tags.

For example: arn:aws:application-autoscaling:us-east-1:123456789012:scalable-target/1234abcd56ab78cd901ef1234567890ab123

To get the ARN for a scalable target, use DescribeScalableTargets.

TagKeys

Required: Yes
Type: Array of strings

One or more tag keys. Specify only the tag keys, not the tag values.

Result Syntax

[]

Result Details

The results for this operation are always empty.

Errors

ResourceNotFoundException:
The specified resource doesn't exist.
ValidationException:
An exception was thrown for a validation issue. Review the available parameters for the API request.

Examples

Example 1: To remove a tag from a scalable target

This example removes the tag pair with the key name "environment" from the scalable target specified by its ARN.

$result = $client->untagResource([
    'ResourceARN' => 'arn:aws:application-autoscaling:us-west-2:123456789012:scalable-target/1234abcd56ab78cd901ef1234567890ab123',
    'TagKeys' => [
        'environment',
    ],
]);

Result syntax:

[
]

Shapes

Alarm

Description

Represents a CloudWatch alarm associated with a scaling policy.

Members

AlarmARN

Required: Yes
Type: string

The Amazon Resource Name (ARN) of the alarm.

AlarmName

Required: Yes
Type: string

The name of the alarm.

ConcurrentUpdateException

Description

Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

Members

Message

Type: string

CustomizedMetricSpecification

Description

Represents a CloudWatch metric of your choosing for a target tracking scaling policy to use with Application Auto Scaling.

For information about the available metrics for a service, see Amazon Web Services services that publish CloudWatch metrics in the Amazon CloudWatch User Guide.

To create your customized metric specification:

Add values for each required parameter from CloudWatch. You can use an existing metric, or a new metric that you create. To use your own metric, you must first publish the metric to CloudWatch. For more information, see Publish custom metrics in the Amazon CloudWatch User Guide.
Choose a metric that changes proportionally with capacity. The value of the metric should increase or decrease in inverse proportion to the number of capacity units. That is, the value of the metric should decrease when capacity increases, and increase when capacity decreases.

For more information about the CloudWatch terminology below, see Amazon CloudWatch concepts in the Amazon CloudWatch User Guide.

Members

Dimensions

Type: Array of MetricDimension structures

The dimensions of the metric.

Conditional: If you published your metric with dimensions, you must specify the same dimensions in your scaling policy.

MetricName

Type: string

The name of the metric. To get the exact metric name, namespace, and dimensions, inspect the Metric object that's returned by a call to ListMetrics.

Metrics

Type: Array of TargetTrackingMetricDataQuery structures

The metrics to include in the target tracking scaling policy, as a metric data query. This can include both raw metric and metric math expressions.

Namespace

Type: string

The namespace of the metric.

Statistic

Type: string

The statistic of the metric.

Unit

Type: string

Required: Yes
Type: string

The name of the dimension.

Value

Required: Yes
Type: string

The value of the dimension.

NotScaledReason

Description

Describes the reason for an activity that isn't scaled (not scaled activity), in machine-readable format. For help interpreting the not scaled reason details, see Scaling activities for Application Auto Scaling.

Members

Code

Required: Yes
Type: string

A code that represents the reason for not scaling.

Valid values:

AutoScalingAnticipatedFlapping
TargetServicePutResourceAsUnscalable
AlreadyAtMaxCapacity
AlreadyAtMinCapacity
AlreadyAtDesiredCapacity

CurrentCapacity

Type: int

The current capacity.

MaxCapacity

Type: int

The maximum capacity.

MinCapacity

Type: int

The minimum capacity.

ObjectNotFoundException

Description

The specified object could not be found. For any operation that depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any operation that deletes or deregisters a resource, this exception is thrown if the resource cannot be found.

Members

Message

Type: string

PredefinedMetricSpecification

Description

Represents a predefined metric for a target tracking scaling policy to use with Application Auto Scaling.

Only the Amazon Web Services that you're using send metrics to Amazon CloudWatch. To determine whether a desired metric already exists by looking up its namespace and dimension using the CloudWatch metrics dashboard in the console, follow the procedure in Building dashboards with CloudWatch in the Application Auto Scaling User Guide.

Members

PredefinedMetricType

Required: Yes
Type: string

The metric type. The ALBRequestCountPerTarget metric type applies only to Spot Fleets and ECS services.

ResourceLabel

Type: string

Identifies the resource associated with the metric type. You can't specify a resource label unless the metric type is ALBRequestCountPerTarget and there is a target group attached to the Spot Fleet or ECS service.

You create the resource label by appending the final portion of the load balancer ARN and the final portion of the target group ARN into a single value, separated by a forward slash (/). The format of the resource label is:

app/my-alb/778d41231b141a0f/targetgroup/my-alb-target-group/943f017f100becff.

Where:

app/<load-balancer-name>/<load-balancer-id> is the final portion of the load balancer ARN
targetgroup/<target-group-name>/<target-group-id> is the final portion of the target group ARN.

To find the ARN for an Application Load Balancer, use the DescribeLoadBalancers API operation. To find the ARN for the target group, use the DescribeTargetGroups API operation.

ResourceNotFoundException

Description

The specified resource doesn't exist.

Members

Message

Type: string

ResourceName

Type: string

The name of the Application Auto Scaling resource. This value is an Amazon Resource Name (ARN).

ScalableTarget

Description

Represents a scalable target.

Members

CreationTime

Required: Yes
Type: timestamp (string|DateTime or anything parsable by strtotime)

The Unix timestamp for when the scalable target was created.

MaxCapacity

Required: Yes
Type: int

The maximum value to scale to in response to a scale-out activity.

MinCapacity

Required: Yes
Type: int

The minimum value to scale to in response to a scale-in activity.

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scalable target. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

RoleARN

Required: Yes
Type: string

The ARN of an IAM role that allows Application Auto Scaling to modify the scalable target on your behalf.

ScalableDimension

Required: Yes
Type: string

The scalable dimension associated with the scalable target. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ScalableTargetARN

Type: string

The ARN of the scalable target.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource, or a custom-resource.

SuspendedState

Type: SuspendedState structure

Specifies whether the scaling activities for a scalable target are in a suspended state.

ScalableTargetAction

Description

Represents the minimum and maximum capacity for a scheduled action.

Members

MaxCapacity

Type: int

The maximum capacity.

Although you can specify a large maximum capacity, note that service quotas may impose lower limits. Each service has its own default quotas for the maximum capacity of the resource. If you want to specify a higher limit, you can request an increase. For more information, consult the documentation for that service. For information about the default quotas for each service, see Service endpoints and quotas in the Amazon Web Services General Reference.

MinCapacity

Type: int

The minimum capacity.

When the scheduled action runs, the resource will have at least this much capacity, but it might have more depending on other settings, such as the target utilization level of a target tracking scaling policy.

ScalingActivity

Description

Represents a scaling activity.

Members

ActivityId

Required: Yes
Type: string

The unique identifier of the scaling activity.

Cause

Required: Yes
Type: string

A simple description of what caused the scaling activity to happen.

Description

Required: Yes
Type: string

A simple description of what action the scaling activity intends to accomplish.

Details

Type: string

The details about the scaling activity.

EndTime

Type: timestamp (string|DateTime or anything parsable by strtotime)

The Unix timestamp for when the scaling activity ended.

NotScaledReasons

Type: Array of NotScaledReason structures

Machine-readable data that describes the reason for a not scaled activity. Only available when DescribeScalingActivities includes not scaled activities.

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scaling activity. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Required: Yes
Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource, or a custom-resource.

StartTime

Required: Yes
Type: timestamp (string|DateTime or anything parsable by strtotime)

The Unix timestamp for when the scaling activity began.

StatusCode

Required: Yes
Type: string

Indicates the status of the scaling activity.

StatusMessage

Type: string

A simple message about the current status of the scaling activity.

ScalingPolicy

Description

Represents a scaling policy to use with Application Auto Scaling.

For more information about configuring scaling policies for a specific service, see Amazon Web Services services that you can use with Application Auto Scaling in the Application Auto Scaling User Guide.

Members

Alarms

Type: Array of Alarm structures

The CloudWatch alarms associated with the scaling policy.

CreationTime

Required: Yes
Type: timestamp (string|DateTime or anything parsable by strtotime)

The Unix timestamp for when the scaling policy was created.

PolicyARN

Required: Yes
Type: string

The Amazon Resource Name (ARN) of the scaling policy.

PolicyName

Required: Yes
Type: string

The name of the scaling policy.

PolicyType

Required: Yes
Type: string

The scaling policy type.

The following policy types are supported:

TargetTrackingScaling—Not supported for Amazon EMR

StepScaling—Not supported for DynamoDB, Amazon Comprehend, Lambda, Amazon Keyspaces, Amazon MSK, Amazon ElastiCache, or Neptune.

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Required: Yes
Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource, or a custom-resource.

StepScalingPolicyConfiguration

Type: StepScalingPolicyConfiguration structure

A step scaling policy.

TargetTrackingScalingPolicyConfiguration

Type: TargetTrackingScalingPolicyConfiguration structure

A target tracking scaling policy.

ScheduledAction

Description

Represents a scheduled action.

Members

CreationTime

Required: Yes
Type: timestamp (string|DateTime or anything parsable by strtotime)

The date and time that the scheduled action was created.

EndTime

Type: timestamp (string|DateTime or anything parsable by strtotime)

The date and time that the action is scheduled to end, in UTC.

ResourceId

Required: Yes
Type: string

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp.
Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE.
EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0.
AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet.
DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table.
DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index.
Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster.
SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering.
Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository.
Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE.
Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE.
Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST. Example: function:my-function:prod or function:my-function:1.
Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable.
Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5.
Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster.
Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster.

ScalableDimension

Type: string

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.
elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.
dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.

ScalableTargetAction

Type: ScalableTargetAction structure

Schedule

Required: Yes
Type: string

The schedule for this action. The following formats are supported:

At expressions - "at(yyyy-mm-ddThh:mm:ss)"
Rate expressions - "rate(value unit)"
Cron expressions - "cron(fields)"

At and cron expressions use Universal Coordinated Time (UTC) by default.

The cron format consists of six fields separated by white spaces: [Minutes] [Hours] [Day_of_Month] [Month] [Day_of_Week] [Year].

For more information and examples, see Example scheduled actions for Application Auto Scaling in the Application Auto Scaling User Guide.

ScheduledActionARN

Required: Yes
Type: string

The Amazon Resource Name (ARN) of the scheduled action.

ScheduledActionName

Required: Yes
Type: string

The name of the scheduled action.

ServiceNamespace

Required: Yes
Type: string

The namespace of the Amazon Web Services service that provides the resource, or a custom-resource.

StartTime

Type: timestamp (string|DateTime or anything parsable by strtotime)

The date and time that the action is scheduled to begin, in UTC.

Timezone

Type: string

The time zone used when referring to the date and time of a scheduled action, when the scheduled action uses an at or cron expression.

StepAdjustment

Description

Represents a step adjustment for a StepScalingPolicyConfiguration. Describes an adjustment based on the difference between the value of the aggregated CloudWatch metric and the breach threshold that you've defined for the alarm.

For the following examples, suppose that you have an alarm with a breach threshold of 50:

To initiate the adjustment when the metric is greater than or equal to 50 and less than 60, specify a lower bound of 0 and an upper bound of 10.
To initiate the adjustment when the metric is greater than 40 and less than or equal to 50, specify a lower bound of -10 and an upper bound of 0.

There are a few rules for the step adjustments for your step policy:

The ranges of your step adjustments can't overlap or have a gap.
At most one step adjustment can have a null lower bound. If one step adjustment has a negative lower bound, then there must be a step adjustment with a null lower bound.
At most one step adjustment can have a null upper bound. If one step adjustment has a positive upper bound, then there must be a step adjustment with a null upper bound.
The upper and lower bound can't be null in the same step adjustment.

Members

MetricIntervalLowerBound

Type: double

The lower bound for the difference between the alarm threshold and the CloudWatch metric. If the metric value is above the breach threshold, the lower bound is inclusive (the metric must be greater than or equal to the threshold plus the lower bound). Otherwise, it's exclusive (the metric must be greater than the threshold plus the lower bound). A null value indicates negative infinity.

MetricIntervalUpperBound

Type: double

The upper bound for the difference between the alarm threshold and the CloudWatch metric. If the metric value is above the breach threshold, the upper bound is exclusive (the metric must be less than the threshold plus the upper bound). Otherwise, it's inclusive (the metric must be less than or equal to the threshold plus the upper bound). A null value indicates positive infinity.

The upper bound must be greater than the lower bound.

ScalingAdjustment

Required: Yes
Type: int

The amount by which to scale, based on the specified adjustment type. A positive value adds to the current capacity while a negative number removes from the current capacity. For exact capacity, you must specify a positive value.

StepScalingPolicyConfiguration

Description

Represents a step scaling policy configuration to use with Application Auto Scaling.

Members

AdjustmentType

Type: string

Specifies how the ScalingAdjustment value in a StepAdjustment is interpreted (for example, an absolute number or a percentage). The valid values are ChangeInCapacity, ExactCapacity, and PercentChangeInCapacity.

AdjustmentType is required if you are adding a new step scaling policy configuration.

Cooldown

Type: int

The amount of time, in seconds, to wait for a previous scaling activity to take effect.

With scale-out policies, the intention is to continuously (but not excessively) scale out. After Application Auto Scaling successfully scales out using a step scaling policy, it starts to calculate the cooldown time. The scaling policy won't increase the desired capacity again unless either a larger scale out is triggered or the cooldown period ends. While the cooldown period is in effect, capacity added by the initiating scale-out activity is calculated as part of the desired capacity for the next scale-out activity. For example, when an alarm triggers a step scaling policy to increase the capacity by 2, the scaling activity completes successfully, and a cooldown period starts. If the alarm triggers again during the cooldown period but at a more aggressive step adjustment of 3, the previous increase of 2 is considered part of the current capacity. Therefore, only 1 is added to the capacity.

With scale-in policies, the intention is to scale in conservatively to protect your application’s availability, so scale-in activities are blocked until the cooldown period has expired. However, if another alarm triggers a scale-out activity during the cooldown period after a scale-in activity, Application Auto Scaling scales out the target immediately. In this case, the cooldown period for the scale-in activity stops and doesn't complete.

Application Auto Scaling provides a default value of 600 for Amazon ElastiCache replication groups and a default value of 300 for the following scalable targets:

AppStream 2.0 fleets
Aurora DB clusters
ECS services
EMR clusters
Neptune clusters
SageMaker endpoint variants
Spot Fleets
Custom resources

For all other scalable targets, the default value is 0:

Amazon Comprehend document classification and entity recognizer endpoints
DynamoDB tables and global secondary indexes
Amazon Keyspaces tables
Lambda provisioned concurrency
Amazon MSK broker storage

MetricAggregationType

Type: string

The aggregation type for the CloudWatch metrics. Valid values are Minimum, Maximum, and Average. If the aggregation type is null, the value is treated as Average.

MinAdjustmentMagnitude

Type: int

The minimum value to scale by when the adjustment type is PercentChangeInCapacity. For example, suppose that you create a step scaling policy to scale out an Amazon ECS service by 25 percent and you specify a MinAdjustmentMagnitude of 2. If the service has 4 tasks and the scaling policy is performed, 25 percent of 4 is 1. However, because you specified a MinAdjustmentMagnitude of 2, Application Auto Scaling scales out the service by 2 tasks.

StepAdjustments

Type: Array of StepAdjustment structures

A set of adjustments that enable you to scale based on the size of the alarm breach.

At least one step adjustment is required if you are adding a new step scaling policy configuration.

SuspendedState

Description

Specifies whether the scaling activities for a scalable target are in a suspended state.

Members

DynamicScalingInSuspended

Type: boolean

Whether scale in by a target tracking scaling policy or a step scaling policy is suspended. Set the value to true if you don't want Application Auto Scaling to remove capacity when a scaling policy is triggered. The default is false.

DynamicScalingOutSuspended

Type: boolean

Whether scale out by a target tracking scaling policy or a step scaling policy is suspended. Set the value to true if you don't want Application Auto Scaling to add capacity when a scaling policy is triggered. The default is false.

ScheduledScalingSuspended

Type: boolean

Whether scheduled scaling is suspended. Set the value to true if you don't want Application Auto Scaling to add or remove capacity by initiating scheduled actions. The default is false.

TargetTrackingMetric

Description

Represents a specific metric.

Metric is a property of the TargetTrackingMetricStat object.

Members

Dimensions

Type: Array of TargetTrackingMetricDimension structures

The dimensions for the metric. For the list of available dimensions, see the Amazon Web Services documentation available from the table in Amazon Web Services services that publish CloudWatch metrics in the Amazon CloudWatch User Guide.

Conditional: If you published your metric with dimensions, you must specify the same dimensions in your scaling policy.

MetricName

Type: string

The name of the metric.

Namespace

Type: string

The namespace of the metric. For more information, see the table in Amazon Web Services services that publish CloudWatch metrics in the Amazon CloudWatch User Guide.

TargetTrackingMetricDataQuery

Description

The metric data to return. Also defines whether this call is returning data for one metric only, or whether it is performing a math expression on the values of returned metric statistics to create a new time series. A time series is a series of data points, each of which is associated with a timestamp.

For more information and examples, see Create a target tracking scaling policy for Application Auto Scaling using metric math in the Application Auto Scaling User Guide.

Members

Expression

Type: string

The math expression to perform on the returned data, if this object is performing a math expression. This expression can use the Id of the other metrics to refer to those metrics, and can also use the Id of other expressions to use the result of those expressions.

Conditional: Within each TargetTrackingMetricDataQuery object, you must specify either Expression or MetricStat, but not both.

Id

Required: Yes
Type: string

A short name that identifies the object's results in the response. This name must be unique among all MetricDataQuery objects specified for a single scaling policy. If you are performing math expressions on this set of data, this name represents that data and can serve as a variable in the mathematical expression. The valid characters are letters, numbers, and underscores. The first character must be a lowercase letter.

Label

Type: string

A human-readable label for this metric or expression. This is especially useful if this is a math expression, so that you know what the value represents.

MetricStat

Type: TargetTrackingMetricStat structure

Information about the metric data to return.

Conditional: Within each MetricDataQuery object, you must specify either Expression or MetricStat, but not both.

ReturnData

Type: boolean

Indicates whether to return the timestamps and raw data values of this metric.

If you use any math expressions, specify true for this value for only the final math expression that the metric specification is based on. You must specify false for ReturnData for all the other metrics and expressions used in the metric specification.

If you are only retrieving metrics and not performing any math expressions, do not specify anything for ReturnData. This sets it to its default (true).

TargetTrackingMetricDimension

Description

Describes the dimension of a metric.

Members

Name

Required: Yes
Type: string

The name of the dimension.

Value

Required: Yes
Type: string

The value of the dimension.

TargetTrackingMetricStat

Description

This structure defines the CloudWatch metric to return, along with the statistic, period, and unit.

For more information about the CloudWatch terminology below, see Amazon CloudWatch concepts in the Amazon CloudWatch User Guide.

Members

Metric

Required: Yes
Type: TargetTrackingMetric structure

The CloudWatch metric to return, including the metric name, namespace, and dimensions. To get the exact metric name, namespace, and dimensions, inspect the Metric object that is returned by a call to ListMetrics.

Stat

Required: Yes
Type: string

The statistic to return. It can include any CloudWatch statistic or extended statistic. For a list of valid values, see the table in Statistics in the Amazon CloudWatch User Guide.

The most commonly used metric for scaling is Average.

Unit

Type: string

The unit to use for the returned data points. For a complete list of the units that CloudWatch supports, see the MetricDatum data type in the Amazon CloudWatch API Reference.

TargetTrackingScalingPolicyConfiguration

Description

Represents a target tracking scaling policy configuration to use with Application Auto Scaling.

Members

CustomizedMetricSpecification

Type: CustomizedMetricSpecification structure

A customized metric. You can specify either a predefined metric or a customized metric.

DisableScaleIn

Type: boolean

Indicates whether scale in by the target tracking scaling policy is disabled. If the value is true, scale in is disabled and the target tracking scaling policy won't remove capacity from the scalable target. Otherwise, scale in is enabled and the target tracking scaling policy can remove capacity from the scalable target. The default value is false.

PredefinedMetricSpecification

Type: PredefinedMetricSpecification structure

A predefined metric. You can specify either a predefined metric or a customized metric.

ScaleInCooldown

Type: int

The amount of time, in seconds, after a scale-in activity completes before another scale-in activity can start.

With the scale-in cooldown period, the intention is to scale in conservatively to protect your application’s availability, so scale-in activities are blocked until the cooldown period has expired. However, if another alarm triggers a scale-out activity during the scale-in cooldown period, Application Auto Scaling scales out the target immediately. In this case, the scale-in cooldown period stops and doesn't complete.

Application Auto Scaling provides a default value of 600 for Amazon ElastiCache replication groups and a default value of 300 for the following scalable targets:

AppStream 2.0 fleets
Aurora DB clusters
ECS services
EMR clusters
Neptune clusters
SageMaker endpoint variants
Spot Fleets
Custom resources

For all other scalable targets, the default value is 0:

Amazon Comprehend document classification and entity recognizer endpoints
DynamoDB tables and global secondary indexes
Amazon Keyspaces tables
Lambda provisioned concurrency
Amazon MSK broker storage

ScaleOutCooldown

Type: int

The amount of time, in seconds, to wait for a previous scale-out activity to take effect.

With the scale-out cooldown period, the intention is to continuously (but not excessively) scale out. After Application Auto Scaling successfully scales out using a target tracking scaling policy, it starts to calculate the cooldown time. The scaling policy won't increase the desired capacity again unless either a larger scale out is triggered or the cooldown period ends. While the cooldown period is in effect, the capacity added by the initiating scale-out activity is calculated as part of the desired capacity for the next scale-out activity.

Application Auto Scaling provides a default value of 600 for Amazon ElastiCache replication groups and a default value of 300 for the following scalable targets:

AppStream 2.0 fleets
Aurora DB clusters
ECS services
EMR clusters
Neptune clusters
SageMaker endpoint variants
Spot Fleets
Custom resources

For all other scalable targets, the default value is 0:

Amazon Comprehend document classification and entity recognizer endpoints
DynamoDB tables and global secondary indexes
Amazon Keyspaces tables
Lambda provisioned concurrency
Amazon MSK broker storage

TargetValue

Required: Yes
Type: double

The target value for the metric. Although this property accepts numbers of type Double, it won't accept values that are either too small or too large. Values must be in the range of -2^360 to 2^360. The value must be a valid number based on the choice of metric. For example, if the metric is CPU utilization, then the target value is a percent value that represents how much of the CPU can be used before scaling out.

If the scaling policy specifies the ALBRequestCountPerTarget predefined metric, specify the target utilization as the optimal average request count per target during any one-minute interval.

TooManyTagsException

Description

The request contains too many tags. Try the request again with fewer tags.

Members

Message

Type: string

ResourceName

Type: string

The name of the Application Auto Scaling resource. This value is an Amazon Resource Name (ARN).

ValidationException

Description

An exception was thrown for a validation issue. Review the available parameters for the API request.

Members

Message

Type: string

Namespaces

Classes

Interfaces

Traits

Exceptions

Functions

Application Auto Scaling 2016-02-06

Operation Summary

Paginators

Operations

DeleteScalingPolicy

Parameter Syntax

Parameter Details

Members

Result Syntax

Result Details

Errors

Examples

Example 1: To delete a scaling policy

DeleteScheduledAction

Parameter Syntax

Parameter Details

Members

Result Syntax

Result Details

Errors

Examples

Example 1: To delete a scheduled action

DeregisterScalableTarget

Parameter Syntax

Parameter Details

Members

Result Syntax

Result Details

Errors

Examples

Example 1: To deregister a scalable target

DescribeScalableTargets

Parameter Syntax

Parameter Details

Members

Result Syntax

Result Details

Members

Errors

Examples

Example 1: To describe scalable targets

DescribeScalingActivities

Parameter Syntax

Parameter Details

Members

Result Syntax

Result Details

Members

Errors

Examples

Example 1: To describe scaling activities for a scalable target

DescribeScalingPolicies

Parameter Syntax

Parameter Details

Members

Result Syntax

Result Details

Members

Errors

Examples

Example 1: To describe scaling policies

DescribeScheduledActions

Parameter Syntax

Parameter Details

Members

Result Syntax

Result Details

Members

Errors

Examples

Example 1: To describe scheduled actions

ListTagsForResource

Parameter Syntax

Parameter Details