[ aws . application-autoscaling ]

describe-scaling-policies

Description

Describes the Application Auto Scaling scaling policies for the specified service namespace.

You can filter the results using ResourceId , ScalableDimension , and PolicyNames .

For more information, see Target tracking scaling policies and Step scaling policies in the Application Auto Scaling User Guide .

See also: AWS API Documentation

describe-scaling-policies is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: ScalingPolicies

Synopsis

  describe-scaling-policies
[--policy-names <value>]
--service-namespace <value>
[--resource-id <value>]
[--scalable-dimension <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
[--cli-binary-format <value>]
[--no-cli-pager]
[--cli-auto-prompt]
[--no-cli-auto-prompt]

Options

--policy-names (list)

The names of the scaling policies to describe.

(string)

Syntax:

"string" "string" ...

--service-namespace (string)

The namespace of the Amazon Web Services service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Possible values:

• ecs
• elasticmapreduce
• ec2
• appstream
• dynamodb
• rds
• sagemaker
• custom-resource
• comprehend
• lambda
• cassandra
• kafka
• elasticache
• neptune
• workspaces

--resource-id (string)

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.

• ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/my-cluster/my-service .
• Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE .
• EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0 .
• AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet .
• DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table .
• DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index .
• Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster .
• SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .
• Custom resources are not supported with a resource type. This parameter must specify the OutputValue 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 GitHub repository .
• Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE .
• Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE .
• Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST . Example: function:my-function:prod or function:my-function:1 .
• Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable .
• Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5 .
• Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster .
• Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster .
• SageMaker serverless endpoint - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .
• SageMaker inference component - The resource type is inference-component and the unique identifier is the resource ID. Example: inference-component/my-inference-component .
• Pool of WorkSpaces - The resource type is workspacespool and the unique identifier is the pool ID. Example: workspacespool/wspool-123456 .

--scalable-dimension (string)

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.

• ecs:service:DesiredCount - The task count of an ECS service.
• elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
• ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
• appstream:fleet:DesiredCapacity - The capacity of an AppStream 2.0 fleet.
• dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
• dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
• dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
• dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
• rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
• sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
• custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
• comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
• comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
• lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
• cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
• cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
• kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
• elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
• elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
• neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.
• sagemaker:variant:DesiredProvisionedConcurrency - The provisioned concurrency for a SageMaker serverless endpoint.
• sagemaker:inference-component:DesiredCopyCount - The number of copies across an endpoint for a SageMaker inference component.
• workspaces:workspacespool:DesiredUserSessions - The number of user sessions for the WorkSpaces in the pool.

Possible values:

• ecs:service:DesiredCount
• ec2:spot-fleet-request:TargetCapacity
• elasticmapreduce:instancegroup:InstanceCount
• appstream:fleet:DesiredCapacity
• dynamodb:table:ReadCapacityUnits
• dynamodb:table:WriteCapacityUnits
• dynamodb:index:ReadCapacityUnits
• dynamodb:index:WriteCapacityUnits
• rds:cluster:ReadReplicaCount
• sagemaker:variant:DesiredInstanceCount
• custom-resource:ResourceType:Property
• comprehend:document-classifier-endpoint:DesiredInferenceUnits
• comprehend:entity-recognizer-endpoint:DesiredInferenceUnits
• lambda:function:ProvisionedConcurrency
• cassandra:table:ReadCapacityUnits
• cassandra:table:WriteCapacityUnits
• kafka:broker-storage:VolumeSize
• elasticache:replication-group:NodeGroups
• elasticache:replication-group:Replicas
• neptune:cluster:ReadReplicaCount
• sagemaker:variant:DesiredProvisionedConcurrency
• sagemaker:inference-component:DesiredCopyCount
• workspaces:workspacespool:DesiredUserSessions

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command’s default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination. If automatic pagination is disabled, the AWS CLI will only make one call, for the first page of results.

--output (string)

The formatting style for command output.

• json
• text
• table
• yaml
• yaml-stream

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

• on
• off
• auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

--cli-binary-format (string)

The formatting style to be used for binary blobs. The default format is base64. The base64 format expects binary blobs to be provided as a base64 encoded string. The raw-in-base64-out format preserves compatibility with AWS CLI V1 behavior and binary values must be passed literally. When providing contents from a file that map to a binary blob fileb:// will always be treated as binary and use the file contents directly regardless of the cli-binary-format setting. When using file:// the file contents will need to properly formatted for the configured cli-binary-format.

• base64
• raw-in-base64-out

--no-cli-pager (boolean)

Disable cli pager for output.

--cli-auto-prompt (boolean)

Automatically prompt for CLI input parameters.

--no-cli-auto-prompt (boolean)

Disable automatically prompt for CLI input parameters.

Examples

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To describe scaling policies

This example command describes the scaling policies for the ecs service namespace.

Command:

aws application-autoscaling describe-scaling-policies --service-namespace ecs

Output:

{
    "ScalingPolicies": [
        {
            "PolicyName": "web-app-cpu-gt-75",
            "ScalableDimension": "ecs:service:DesiredCount",
            "ResourceId": "service/default/web-app",
            "CreationTime": 1462561899.23,
            "StepScalingPolicyConfiguration": {
                "Cooldown": 60,
                "StepAdjustments": [
                    {
                        "ScalingAdjustment": 200,
                        "MetricIntervalLowerBound": 0.0
                    }
                ],
                "AdjustmentType": "PercentChangeInCapacity"
            },
            "PolicyARN": "arn:aws:autoscaling:us-west-2:012345678910:scalingPolicy:6d8972f3-efc8-437c-92d1-6270f29a66e7:resource/ecs/service/default/web-app:policyName/web-app-cpu-gt-75",
            "PolicyType": "StepScaling",
            "Alarms": [
                {
                    "AlarmName": "web-app-cpu-gt-75",
                    "AlarmARN": "arn:aws:cloudwatch:us-west-2:012345678910:alarm:web-app-cpu-gt-75"
                }
            ],
            "ServiceNamespace": "ecs"
        },
        {
            "PolicyName": "web-app-cpu-lt-25",
            "ScalableDimension": "ecs:service:DesiredCount",
            "ResourceId": "service/default/web-app",
            "CreationTime": 1462562575.099,
            "StepScalingPolicyConfiguration": {
                "Cooldown": 1,
                "StepAdjustments": [
                    {
                        "ScalingAdjustment": -50,
                        "MetricIntervalUpperBound": 0.0
                    }
                ],
                "AdjustmentType": "PercentChangeInCapacity"
            },
            "PolicyARN": "arn:aws:autoscaling:us-west-2:012345678910:scalingPolicy:6d8972f3-efc8-437c-92d1-6270f29a66e7:resource/ecs/service/default/web-app:policyName/web-app-cpu-lt-25",
            "PolicyType": "StepScaling",
            "Alarms": [
                {
                    "AlarmName": "web-app-cpu-lt-25",
                    "AlarmARN": "arn:aws:cloudwatch:us-west-2:012345678910:alarm:web-app-cpu-lt-25"
                }
            ],
            "ServiceNamespace": "ecs"
        }
    ]
}

Output

ScalingPolicies -> (list)

Information about the scaling policies.

(structure)

Represents a scaling policy to use with Application Auto Scaling.

For more information about configuring scaling policies for a specific service, see Amazon Web Services services that you can use with Application Auto Scaling in the Application Auto Scaling User Guide .

PolicyARN -> (string)

The Amazon Resource Name (ARN) of the scaling policy.

PolicyName -> (string)

The name of the scaling policy.

ServiceNamespace -> (string)

The namespace of the Amazon Web Services service that provides the resource, or a custom-resource .

ResourceId -> (string)

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.

• ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/my-cluster/my-service .
• Spot Fleet - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE .
• EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0 .
• AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet .
• DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table .
• DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index .
• Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster .
• SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .
• Custom resources are not supported with a resource type. This parameter must specify the OutputValue 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 GitHub repository .
• Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE .
• Amazon Comprehend entity recognizer endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE .
• Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST . Example: function:my-function:prod or function:my-function:1 .
• Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable .
• Amazon MSK cluster - The resource type and unique identifier are specified using the cluster ARN. Example: arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5 .
• Amazon ElastiCache replication group - The resource type is replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster .
• Neptune cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:mycluster .
• SageMaker serverless endpoint - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .
• SageMaker inference component - The resource type is inference-component and the unique identifier is the resource ID. Example: inference-component/my-inference-component .
• Pool of WorkSpaces - The resource type is workspacespool and the unique identifier is the pool ID. Example: workspacespool/wspool-123456 .

ScalableDimension -> (string)

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

• ecs:service:DesiredCount - The task count of an ECS service.
• elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.
• ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
• appstream:fleet:DesiredCapacity - The capacity of an AppStream 2.0 fleet.
• dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.
• dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.
• dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.
• dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.
• rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.
• sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a SageMaker model endpoint variant.
• custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.
• comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.
• comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend entity recognizer endpoint.
• lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.
• cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.
• cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.
• kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for brokers in an Amazon MSK cluster.
• elasticache:replication-group:NodeGroups - The number of node groups for an Amazon ElastiCache replication group.
• elasticache:replication-group:Replicas - The number of replicas per node group for an Amazon ElastiCache replication group.
• neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon Neptune DB cluster.
• sagemaker:variant:DesiredProvisionedConcurrency - The provisioned concurrency for a SageMaker serverless endpoint.
• sagemaker:inference-component:DesiredCopyCount - The number of copies across an endpoint for a SageMaker inference component.
• workspaces:workspacespool:DesiredUserSessions - The number of user sessions for the WorkSpaces in the pool.

PolicyType -> (string)

The scaling policy type.

The following policy types are supported:

TargetTrackingScaling —Not supported for Amazon EMR

StepScaling —Not supported for DynamoDB, Amazon Comprehend, Lambda, Amazon Keyspaces, Amazon MSK, Amazon ElastiCache, or Neptune.

StepScalingPolicyConfiguration -> (structure)

A step scaling policy.

AdjustmentType -> (string)

Specifies how the ScalingAdjustment value in a StepAdjustment 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.

StepAdjustments -> (list)

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.

(structure)

Represents a step adjustment for a StepScalingPolicyConfiguration . Describes an adjustment based on the difference between the value of the aggregated CloudWatch metric and the breach threshold that you’ve defined for the alarm.

For the following examples, suppose that you have an alarm with a breach threshold of 50:

• To initiate the adjustment when the metric is greater than or equal to 50 and less than 60, specify a lower bound of 0 and an upper bound of 10 .
• To initiate the adjustment when the metric is greater than 40 and less than or equal to 50, specify a lower bound of -10 and an upper bound of 0 .

There are a few rules for the step adjustments for your step policy:

• The ranges of your step adjustments can’t overlap or have a gap.
• At most one step adjustment can have a null lower bound. If one step adjustment has a negative lower bound, then there must be a step adjustment with a null lower bound.
• At most one step adjustment can have a null upper bound. If one step adjustment has a positive upper bound, then there must be a step adjustment with a null upper bound.
• The upper and lower bound can’t be null in the same step adjustment.

MetricIntervalLowerBound -> (double)

The lower bound for the difference between the alarm threshold and the CloudWatch metric. If the metric value is above the breach threshold, the lower bound is inclusive (the metric must be greater than or equal to the threshold plus the lower bound). Otherwise, it’s exclusive (the metric must be greater than the threshold plus the lower bound). A null value indicates negative infinity.

MetricIntervalUpperBound -> (double)

The upper bound for the difference between the alarm threshold and the CloudWatch metric. If the metric value is above the breach threshold, the upper bound is exclusive (the metric must be less than the threshold plus the upper bound). Otherwise, it’s inclusive (the metric must be less than or equal to the threshold plus the upper bound). A null value indicates positive infinity.

The upper bound must be greater than the lower bound.

ScalingAdjustment -> (integer)

The amount by which to scale, based on the specified adjustment type. A positive value adds to the current capacity while a negative number removes from the current capacity. For exact capacity, you must specify a non-negative value.

MinAdjustmentMagnitude -> (integer)

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.

Cooldown -> (integer)

The amount of time, in seconds, to wait for a previous scaling activity to take effect. If not specified, the default value is 300. For more information, see Cooldown period in the Application Auto Scaling User Guide .

MetricAggregationType -> (string)

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 .

TargetTrackingScalingPolicyConfiguration -> (structure)

A target tracking scaling policy.

TargetValue -> (double)

The target value for the metric. Although this property accepts numbers of type Double, it won’t accept values that are either too small or too large. Values must be in the range of -2^360 to 2^360. The value must be a valid number based on the choice of metric. For example, if the metric is CPU utilization, then the target value is a percent value that represents how much of the CPU can be used before scaling out.

Note

If the scaling policy specifies the ALBRequestCountPerTarget predefined metric, specify the target utilization as the optimal average request count per target during any one-minute interval.

PredefinedMetricSpecification -> (structure)

A predefined metric. You can specify either a predefined metric or a customized metric.

PredefinedMetricType -> (string)

The metric type. The ALBRequestCountPerTarget metric type applies only to Spot Fleets and ECS services.

ResourceLabel -> (string)

Identifies the resource associated with the metric type. You can’t specify a resource label unless the metric type is ALBRequestCountPerTarget and there is a target group attached to the Spot Fleet or ECS service.

You create the resource label by appending the final portion of the load balancer ARN and the final portion of the target group ARN into a single value, separated by a forward slash (/). The format of the resource label is:

app/my-alb/778d41231b141a0f/targetgroup/my-alb-target-group/943f017f100becff .

Where:

• app/<load-balancer-name>/<load-balancer-id> is the final portion of the load balancer ARN
• targetgroup/<target-group-name>/<target-group-id> is the final portion of the target group ARN.

To find the ARN for an Application Load Balancer, use the DescribeLoadBalancers API operation. To find the ARN for the target group, use the DescribeTargetGroups API operation.

CustomizedMetricSpecification -> (structure)

A customized metric. You can specify either a predefined metric or a customized metric.

MetricName -> (string)

The name of the metric. To get the exact metric name, namespace, and dimensions, inspect the Metric object that’s returned by a call to ListMetrics .

Namespace -> (string)

The namespace of the metric.

Dimensions -> (list)

The dimensions of the metric.

Conditional: If you published your metric with dimensions, you must specify the same dimensions in your scaling policy.

(structure)

Describes the dimension names and values associated with a metric.

Name -> (string)

The name of the dimension.

Value -> (string)

The value of the dimension.

Statistic -> (string)

The statistic of the metric.

Unit -> (string)

The unit of the metric. For a complete list of the units that CloudWatch supports, see the MetricDatum data type in the Amazon CloudWatch API Reference .

Metrics -> (list)

The metrics to include in the target tracking scaling policy, as a metric data query. This can include both raw metric and metric math expressions.

(structure)

The metric data to return. Also defines whether this call is returning data for one metric only, or whether it is performing a math expression on the values of returned metric statistics to create a new time series. A time series is a series of data points, each of which is associated with a timestamp.

For more information and examples, see Create a target tracking scaling policy for Application Auto Scaling using metric math in the Application Auto Scaling User Guide .

Expression -> (string)

The math expression to perform on the returned data, if this object is performing a math expression. This expression can use the Id of the other metrics to refer to those metrics, and can also use the Id of other expressions to use the result of those expressions.

Conditional: Within each TargetTrackingMetricDataQuery object, you must specify either Expression or MetricStat , but not both.

Id -> (string)

A short name that identifies the object’s results in the response. This name must be unique among all MetricDataQuery objects specified for a single scaling policy. If you are performing math expressions on this set of data, this name represents that data and can serve as a variable in the mathematical expression. The valid characters are letters, numbers, and underscores. The first character must be a lowercase letter.

Label -> (string)

A human-readable label for this metric or expression. This is especially useful if this is a math expression, so that you know what the value represents.

MetricStat -> (structure)

Information about the metric data to return.

Conditional: Within each MetricDataQuery object, you must specify either Expression or MetricStat , but not both.

Metric -> (structure)

The CloudWatch metric to return, including the metric name, namespace, and dimensions. To get the exact metric name, namespace, and dimensions, inspect the Metric object that is returned by a call to ListMetrics .

Dimensions -> (list)

The dimensions for the metric. For the list of available dimensions, see the Amazon Web Services documentation available from the table in Amazon Web Services services that publish CloudWatch metrics in the Amazon CloudWatch User Guide .

Conditional: If you published your metric with dimensions, you must specify the same dimensions in your scaling policy.

(structure)

Describes the dimension of a metric.

Name -> (string)

The name of the dimension.

Value -> (string)

The value of the dimension.

MetricName -> (string)

The name of the metric.

Namespace -> (string)

The namespace of the metric. For more information, see the table in Amazon Web Services services that publish CloudWatch metrics in the Amazon CloudWatch User Guide .

Stat -> (string)

The statistic to return. It can include any CloudWatch statistic or extended statistic. For a list of valid values, see the table in Statistics in the Amazon CloudWatch User Guide .

The most commonly used metric for scaling is Average .

Unit -> (string)

The unit to use for the returned data points. For a complete list of the units that CloudWatch supports, see the MetricDatum data type in the Amazon CloudWatch API Reference .

ReturnData -> (boolean)

Indicates whether to return the timestamps and raw data values of this metric.

If you use any math expressions, specify true for this value for only the final math expression that the metric specification is based on. You must specify false for ReturnData for all the other metrics and expressions used in the metric specification.

If you are only retrieving metrics and not performing any math expressions, do not specify anything for ReturnData . This sets it to its default (true ).

ScaleOutCooldown -> (integer)

The amount of time, in seconds, to wait for a previous scale-out activity to take effect. For more information and for default values, see Define cooldown periods in the Application Auto Scaling User Guide .

ScaleInCooldown -> (integer)

The amount of time, in seconds, after a scale-in activity completes before another scale-in activity can start. For more information and for default values, see Define cooldown periods in the Application Auto Scaling User Guide .

DisableScaleIn -> (boolean)

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 .

Alarms -> (list)

The CloudWatch alarms associated with the scaling policy.

(structure)

Represents a CloudWatch alarm associated with a scaling policy.

AlarmName -> (string)

The name of the alarm.

AlarmARN -> (string)

The Amazon Resource Name (ARN) of the alarm.

CreationTime -> (timestamp)

The Unix timestamp for when the scaling policy was created.

NextToken -> (string)

The token required to get the next set of results. This value is null if there are no more results to return.