AWS::ApplicationAutoScaling::ScalingPolicy TargetTrackingScalingPolicyConfiguration

TargetTrackingScalingPolicyConfiguration is a property of ScalingPolicy that specifies a target tracking scaling policy to use with 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 is false.

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 300 for the following scalable targets:

• ECS services

• Spot Fleet requests

• EMR clusters

• AppStream 2.0 fleets

• Aurora DB clusters

• Amazon SageMaker endpoint variants

• Custom resources

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

• DynamoDB tables

• DynamoDB global secondary indexes

• Amazon Comprehend document classification and entity recognizer endpoints

• Lambda provisioned concurrency

• Amazon Keyspaces tables

• 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 300 for the following scalable targets:

• ECS services

• Spot Fleet requests

• EMR clusters

• AppStream 2.0 fleets

• Aurora DB clusters

• Amazon SageMaker endpoint variants

• Custom resources

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

• DynamoDB tables

• DynamoDB global secondary indexes

• Amazon Comprehend document classification and entity recognizer endpoints

• Lambda provisioned concurrency

• Amazon Keyspaces tables

• Amazon MSK broker storage

Required: No

Type: Integer

Update requires: No interruption

TargetValue

The target value for the metric.

Required: Yes

Type: Double

Update requires: No interruption