Represents a step scaling policy configuration.
The adjustment type, which specifies how the
ScalingAdjustmentparameter in a StepAdjustment is interpreted.
ChangeInCapacity | PercentChangeInCapacity | ExactCapacity
The amount of time, in seconds, after a scaling activity completes where previous trigger-related scaling activities can influence future scaling events.
For scale out policies, while
Cooldownis in effect, the capacity that has been added by the previous scale out event that initiated the
Cooldownis calculated as part of the desired capacity for the next scale out. The intention is to continuously (but not excessively) scale out. For example, an alarm triggers a step scaling policy to scale out an Amazon ECS service by 2 tasks, the scaling activity completes successfully, and a
Cooldownperiod of 5 minutes starts. During the
Cooldownperiod, if the alarm triggers the same policy again but at a more aggressive step adjustment to scale out the service by 3 tasks, the 2 tasks that were added in the previous scale out event are considered part of that capacity and only 1 additional task is added to the desired count.
For scale in policies, the
Cooldownperiod is used to block subsequent scale in requests until it has expired. The intention is to scale in conservatively to protect your application's availability. However, if another alarm triggers a scale out policy during the
Cooldownperiod after a scale-in, Application Auto Scaling scales out your scalable target immediately.
The aggregation type for the CloudWatch metrics. Valid values are
Average | Minimum | Maximum
The minimum number to adjust your scalable dimension as a result of a scaling activity. If the adjustment type is
PercentChangeInCapacity, the scaling policy changes the scalable dimension of the scalable target by this amount.
A set of adjustments that enable you to scale based on the size of the alarm breach.
Type: array of StepAdjustment objects
For more information about using this API in one of the language-specific AWS SDKs, see the following: