AWS Auto Scaling
API Reference (API Version 2018-01-06)


Retrieves the forecast data for a scalable resource.

Capacity forecasts are represented as predicted values, or data points, that are calculated using historical data points from a specified CloudWatch load metric. Data points are available for up to 56 days.

Request Syntax

{ "EndTime": number, "ForecastDataType": "string", "ResourceId": "string", "ScalableDimension": "string", "ScalingPlanName": "string", "ScalingPlanVersion": number, "ServiceNamespace": "string", "StartTime": number }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.


The exclusive end time of the time range for the forecast data to get. The maximum time duration between the start and end time is seven days.

Although this parameter can accept a date and time that is more than two days in the future, the availability of forecast data has limits. AWS Auto Scaling only issues forecasts for periods of two days in advance.

Type: Timestamp

Required: Yes


The type of forecast data to get.

  • LoadForecast: The load metric forecast.

  • CapacityForecast: The capacity forecast.

  • ScheduledActionMinCapacity: The minimum capacity for each scheduled scaling action. This data is calculated as the larger of two values: the capacity forecast or the minimum capacity in the scaling instruction.

  • ScheduledActionMaxCapacity: The maximum capacity for each scheduled scaling action. The calculation used is determined by the predictive scaling maximum capacity behavior setting in the scaling instruction.

Type: String

Valid Values: CapacityForecast | LoadForecast | ScheduledActionMinCapacity | ScheduledActionMaxCapacity

Required: Yes


The ID of the resource. This string consists of the resource type and unique identifier.

  • Auto Scaling group - The resource type is autoScalingGroup and the unique identifier is the name of the Auto Scaling group. Example: autoScalingGroup/my-asg.

  • 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 request - 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.

  • DynamoDB table - The resource type is table and the unique identifier is the resource ID. Example: table/my-table.

  • DynamoDB global secondary index - The resource type is index and the unique identifier is the resource ID. 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.

Type: String

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: Yes


The scalable dimension for the resource.

Type: String

Valid Values: autoscaling:autoScalingGroup:DesiredCapacity | ecs:service:DesiredCount | ec2:spot-fleet-request:TargetCapacity | rds:cluster:ReadReplicaCount | dynamodb:table:ReadCapacityUnits | dynamodb:table:WriteCapacityUnits | dynamodb:index:ReadCapacityUnits | dynamodb:index:WriteCapacityUnits

Required: Yes


The name of the scaling plan.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: [\p{Print}&&[^|:/]]+

Required: Yes


The version number of the scaling plan.

Type: Long

Required: Yes


The namespace of the AWS service.

Type: String

Valid Values: autoscaling | ecs | ec2 | rds | dynamodb

Required: Yes


The inclusive start time of the time range for the forecast data to get. The date and time can be at most 56 days before the current date and time.

Type: Timestamp

Required: Yes

Response Syntax

{ "Datapoints": [ { "Timestamp": number, "Value": number } ] }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


The data points to return.

Type: Array of Datapoint objects


For information about the errors that are common to all actions, see Common Errors.


The service encountered an internal error.

HTTP Status Code: 400


An exception was thrown for a validation issue. Review the parameters provided.

HTTP Status Code: 400

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: