AWS::ApplicationAutoScaling::ScalingPolicy TargetTrackingScalingPolicyConfiguration
TargetTrackingScalingPolicyConfiguration
is a property of the AWS::ApplicationAutoScaling::ScalingPolicy resource that specifies a target
tracking scaling policy configuration for Application Auto Scaling. Use a target tracking
scaling policy to adjust the capacity of the specified scalable target in response to actual
workloads, so that resource utilization remains at or near the target utilization value.
For more information, see PutScalingPolicy in the Application Auto Scaling API Reference. For more information about target tracking scaling policies, see Target tracking scaling policies in the Application Auto Scaling User Guide.
Syntax
To declare this entity in your AWS CloudFormation template, use the following syntax:
JSON
{ "CustomizedMetricSpecification" :
CustomizedMetricSpecification
, "DisableScaleIn" :Boolean
, "PredefinedMetricSpecification" :PredefinedMetricSpecification
, "ScaleInCooldown" :Integer
, "ScaleOutCooldown" :Integer
, "TargetValue" :Double
}
YAML
CustomizedMetricSpecification:
CustomizedMetricSpecification
DisableScaleIn:Boolean
PredefinedMetricSpecification:PredefinedMetricSpecification
ScaleInCooldown:Integer
ScaleOutCooldown:Integer
TargetValue:Double
Properties
CustomizedMetricSpecification
-
A customized metric. You can specify either a predefined metric or a customized metric.
Required: No
Type: CustomizedMetricSpecification
Update requires: No interruption
DisableScaleIn
-
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 isfalse
.Required: No
Type: Boolean
Update requires: No interruption
PredefinedMetricSpecification
-
A predefined metric. You can specify either a predefined metric or a customized metric.
Required: No
Type: PredefinedMetricSpecification
Update requires: No interruption
ScaleInCooldown
-
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
Required: No
Type: Integer
Update requires: No interruption
-
ScaleOutCooldown
-
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
Required: No
Type: Integer
Update requires: No interruption
-
TargetValue
-
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.
Required: Yes
Type: Double
Update requires: No interruption
See also
-
Getting started in the Application Auto Scaling User Guide