AdjustmentType => Str

Specifies how the "ScalingAdjustment" value in a StepAdjustment (https://docs.aws.amazon.com/autoscaling/application/APIReference/API_StepAdjustment.html) 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 => 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 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

MetricAggregationType => Str

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 => 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 => ArrayRef[Paws::ApplicationAutoScaling::StepAdjustment]

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.