<p>The identifier of the resource associated with the scaling activity. This string consists of the resource type and unique identifier.</p> <ul> <li> <p>ECS service - The resource type is <code>service</code> and the unique identifier is the cluster name and service name. Example: <code>service/default/sample-webapp</code>.</p> </li> <li> <p>Spot Fleet - The resource type is <code>spot-fleet-request</code> and the unique identifier is the Spot Fleet request ID. Example: <code>spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE</code>.</p> </li> <li> <p>EMR cluster - The resource type is <code>instancegroup</code> and the unique identifier is the cluster ID and instance group ID. Example: <code>instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0</code>.</p> </li> <li> <p>AppStream 2.0 fleet - The resource type is <code>fleet</code> and the unique identifier is the fleet name. Example: <code>fleet/sample-fleet</code>.</p> </li> <li> <p>DynamoDB table - The resource type is <code>table</code> and the unique identifier is the table name. Example: <code>table/my-table</code>.</p> </li> <li> <p>DynamoDB global secondary index - The resource type is <code>index</code> and the unique identifier is the index name. Example: <code>table/my-table/index/my-table-index</code>.</p> </li> <li> <p>Aurora DB cluster - The resource type is <code>cluster</code> and the unique identifier is the cluster name. Example: <code>cluster:my-db-cluster</code>.</p> </li> <li> <p>SageMaker endpoint variant - The resource type is <code>variant</code> and the unique identifier is the resource ID. Example: <code>endpoint/my-end-point/variant/KMeansClustering</code>.</p> </li> <li> <p>Custom resources are not supported with a resource type. This parameter must specify the <code>OutputValue</code> from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our <a href="https://github.com/aws/aws-auto-scaling-custom-resource">GitHub repository</a>.</p> </li> <li> <p>Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: <code>arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE</code>.</p> </li> <li> <p>Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: <code>arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE</code>.</p> </li> <li> <p>Lambda provisioned concurrency - The resource type is <code>function</code> and the unique identifier is the function name with a function version or alias name suffix that is not <code>$LATEST</code>. Example: <code>function:my-function:prod</code> or <code>function:my-function:1</code>.</p> </li> <li> <p>Amazon Keyspaces table - The resource type is <code>table</code> and the unique identifier is the table name. Example: <code>keyspace/mykeyspace/table/mytable</code>.</p> </li> <li> <p>Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: <code>arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5</code>.</p> </li> <li> <p>Amazon ElastiCache replication group - The resource type is <code>replication-group</code> and the unique identifier is the replication group name. Example: <code>replication-group/mycluster</code>.</p> </li> <li> <p>Neptune cluster - The resource type is <code>cluster</code> and the unique identifier is the cluster name. Example: <code>cluster:mycluster</code>.</p> </li> </ul>

<p>The scalable dimension. This string consists of the service namespace, resource type, and scaling property. If you specify a scalable dimension, you must also specify a resource ID.</p> <ul> <li> <p> <code>ecs:service:DesiredCount</code> - The desired task count of an ECS service.</p> </li> <li> <p> <code>elasticmapreduce:instancegroup:InstanceCount</code> - The instance count of an EMR Instance Group.</p> </li> <li> <p> <code>ec2:spot-fleet-request:TargetCapacity</code> - The target capacity of a Spot Fleet.</p> </li> <li> <p> <code>appstream:fleet:DesiredCapacity</code> - The desired capacity of an AppStream 2.0 fleet.</p> </li> <li> <p> <code>dynamodb:table:ReadCapacityUnits</code> - The provisioned read capacity for a DynamoDB table.</p> </li> <li> <p> <code>dynamodb:table:WriteCapacityUnits</code> - The provisioned write capacity for a DynamoDB table.</p> </li> <li> <p> <code>dynamodb:index:ReadCapacityUnits</code> - The provisioned read capacity for a DynamoDB global secondary index.</p> </li> <li> <p> <code>dynamodb:index:WriteCapacityUnits</code> - The provisioned write capacity for a DynamoDB global secondary index.</p> </li> <li> <p> <code>rds:cluster:ReadReplicaCount</code> - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.</p> </li> <li> <p> <code>sagemaker:variant:DesiredInstanceCount</code> - The number of EC2 instances for a SageMaker model endpoint variant.</p> </li> <li> <p> <code>custom-resource:ResourceType:Property</code> - The scalable dimension for a custom resource provided by your own application or service.</p> </li> <li> <p> <code>comprehend:document-classifier-endpoint:DesiredInferenceUnits</code> - The number of inference units for an Amazon Comprehend document classification endpoint.</p> </li> <li> <p> <code>comprehend:entity-recognizer-endpoint:DesiredInferenceUnits</code> - The number of inference units for an Amazon Comprehend entity recognizer endpoint.</p> </li> <li> <p> <code>lambda:function:ProvisionedConcurrency</code> - The provisioned concurrency for a Lambda function.</p> </li> <li> <p> <code>cassandra:table:ReadCapacityUnits</code> - The provisioned read capacity for an Amazon Keyspaces table.</p> </li> <li> <p> <code>cassandra:table:WriteCapacityUnits</code> - The provisioned write capacity for an Amazon Keyspaces table.</p> </li> <li> <p> <code>kafka:broker-storage:VolumeSize</code> - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.</p> </li> <li> <p> <code>elasticache:replication-group:NodeGroups</code> - The number of node groups for an Amazon ElastiCache replication group.</p> </li> <li> <p> <code>elasticache:replication-group:Replicas</code> - The number of replicas per node group for an Amazon ElastiCache replication group.</p> </li> <li> <p> <code>neptune:cluster:ReadReplicaCount</code> - The count of read replicas in an Amazon Neptune DB cluster.</p> </li> </ul>

<p>The maximum number of scalable targets. This value can be between 1 and 50. The default value is 50.</p> <p>If this parameter is used, the operation returns up to <code>MaxResults</code> results at a time, along with a <code>NextToken</code> value. To get the next set of results, include the <code>NextToken</code> value in a subsequent call. If this parameter is not used, the operation returns up to 50 results and a <code>NextToken</code> value, if applicable.</p>