Application Auto Scaling

Stores scalable targets, scaling policies, and scheduled actions for the resource types Terraform/CDK templates wire up most often (ECS services, Lambda provisioned concurrency, DynamoDB read/write capacity, AppStream fleets, etc.). The emulator never actually evaluates policies or executes scaling decisions — DescribeScalingActivities always returns an empty list.

Endpoint: http://localhost:4566Signing name: application-autoscalingProtocol: AWS-JSON 1.1 (X-Amz-Target prefix: AnyScaleFrontendService)

Operations

Operation	Notes
RegisterScalableTarget	Idempotent on (ServiceNamespace, ResourceId, ScalableDimension) — re-register fills in only the fields you supply, keeping prior values for the rest.
DeregisterScalableTarget	Cascades to delete every policy and scheduled action attached to the target.
DescribeScalableTargets	Filter by ResourceIds and ScalableDimension.
PutScalingPolicy	Rejects with ObjectNotFoundException if no scalable target exists for the supplied (ServiceNamespace, ResourceId, ScalableDimension). Returns Alarms: [].
DeleteScalingPolicy / DescribeScalingPolicies	Standard CRUD.
PutScheduledAction / DeleteScheduledAction / DescribeScheduledActions	Schedule string is stored verbatim — no cron parsing.
DescribeScalingActivities	Always { "ScalingActivities": [] }.

Behavior notes

• All resources are keyed by {ServiceNamespace}|{ResourceId}|{ScalableDimension}.
• The default RoleARN for new scalable targets points at the standard service-linked role ARN.
• PolicyType defaults to TargetTrackingScaling when omitted on PutScalingPolicy.