describe_scaling_policies(**kwargs)¶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
Request Syntax
response = client.describe_scaling_policies(
PolicyNames=[
'string',
],
ServiceNamespace='ecs'|'elasticmapreduce'|'ec2'|'appstream'|'dynamodb'|'rds'|'sagemaker'|'custom-resource'|'comprehend'|'lambda'|'cassandra'|'kafka'|'elasticache'|'neptune',
ResourceId='string',
ScalableDimension='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',
MaxResults=123,
NextToken='string'
)
The names of the scaling policies to describe.
[REQUIRED]
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.
The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.
service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp .spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE .instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0 .fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet .table and the unique identifier is the table name. Example: table/my-table .index and the unique identifier is the index name. Example: table/my-table/index/my-table-index .cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster .variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .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.arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE .arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE .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 .table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable .arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5 .replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster .cluster and the unique identifier is the cluster name. Example: cluster:mycluster .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 desired 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 desired 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.The maximum number of scalable targets. This value can be between 1 and 10. The default value is 10.
If this parameter is used, the operation returns up to MaxResults results at a time, along with a NextToken value. To get the next set of results, include the NextToken value in a subsequent call. If this parameter is not used, the operation returns up to 10 results and a NextToken value, if applicable.
dict
Response Syntax
{
'ScalingPolicies': [
{
'PolicyARN': 'string',
'PolicyName': 'string',
'ServiceNamespace': 'ecs'|'elasticmapreduce'|'ec2'|'appstream'|'dynamodb'|'rds'|'sagemaker'|'custom-resource'|'comprehend'|'lambda'|'cassandra'|'kafka'|'elasticache'|'neptune',
'ResourceId': 'string',
'ScalableDimension': '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',
'PolicyType': 'StepScaling'|'TargetTrackingScaling',
'StepScalingPolicyConfiguration': {
'AdjustmentType': 'ChangeInCapacity'|'PercentChangeInCapacity'|'ExactCapacity',
'StepAdjustments': [
{
'MetricIntervalLowerBound': 123.0,
'MetricIntervalUpperBound': 123.0,
'ScalingAdjustment': 123
},
],
'MinAdjustmentMagnitude': 123,
'Cooldown': 123,
'MetricAggregationType': 'Average'|'Minimum'|'Maximum'
},
'TargetTrackingScalingPolicyConfiguration': {
'TargetValue': 123.0,
'PredefinedMetricSpecification': {
'PredefinedMetricType': 'DynamoDBReadCapacityUtilization'|'DynamoDBWriteCapacityUtilization'|'ALBRequestCountPerTarget'|'RDSReaderAverageCPUUtilization'|'RDSReaderAverageDatabaseConnections'|'EC2SpotFleetRequestAverageCPUUtilization'|'EC2SpotFleetRequestAverageNetworkIn'|'EC2SpotFleetRequestAverageNetworkOut'|'SageMakerVariantInvocationsPerInstance'|'ECSServiceAverageCPUUtilization'|'ECSServiceAverageMemoryUtilization'|'AppStreamAverageCapacityUtilization'|'ComprehendInferenceUtilization'|'LambdaProvisionedConcurrencyUtilization'|'CassandraReadCapacityUtilization'|'CassandraWriteCapacityUtilization'|'KafkaBrokerStorageUtilization'|'ElastiCachePrimaryEngineCPUUtilization'|'ElastiCacheReplicaEngineCPUUtilization'|'ElastiCacheDatabaseMemoryUsageCountedForEvictPercentage'|'NeptuneReaderAverageCPUUtilization',
'ResourceLabel': 'string'
},
'CustomizedMetricSpecification': {
'MetricName': 'string',
'Namespace': 'string',
'Dimensions': [
{
'Name': 'string',
'Value': 'string'
},
],
'Statistic': 'Average'|'Minimum'|'Maximum'|'SampleCount'|'Sum',
'Unit': 'string'
},
'ScaleOutCooldown': 123,
'ScaleInCooldown': 123,
'DisableScaleIn': True|False
},
'Alarms': [
{
'AlarmName': 'string',
'AlarmARN': 'string'
},
],
'CreationTime': datetime(2015, 1, 1)
},
],
'NextToken': 'string'
}
Response Structure
(dict) --
ScalingPolicies (list) --
Information about the scaling policies.
(dict) --
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.
service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp .spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE .instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0 .fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet .table and the unique identifier is the table name. Example: table/my-table .index and the unique identifier is the index name. Example: table/my-table/index/my-table-index .cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster .variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .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.arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE .arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE .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 .table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable .arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5 .replication-group and the unique identifier is the replication group name. Example: replication-group/mycluster .cluster and the unique identifier is the cluster name. Example: cluster:mycluster .ScalableDimension (string) --
The scalable dimension. This string consists of the service namespace, resource type, and scaling property.
ecs:service:DesiredCount - The desired 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 desired 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.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 (dict) --
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 .
AdjustmentTypeis 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.
(dict) --
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:
There are a few rules for the step adjustments for your step policy:
MetricIntervalLowerBound (float) --
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 is exclusive (the metric must be greater than the threshold plus the lower bound). A null value indicates negative infinity.
MetricIntervalUpperBound (float) --
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 is 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 positive 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.
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 600 for Amazon ElastiCache replication groups and a default value of 300 for the following scalable targets:
For all other scalable targets, the default value is 0:
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 (dict) --
A target tracking scaling policy.
TargetValue (float) --
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 (dict) --
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:
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 (dict) --
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 is 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.
(dict) --
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 .
ScaleOutCooldown (integer) --
The amount of time, in seconds, to wait for a previous scale-out activity to take effect.
With the scale-out cooldown period , the intention is to continuously (but not excessively) scale out. After Application Auto Scaling successfully scales out using a target tracking 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, the capacity added by the initiating scale-out activity is calculated as part of the desired capacity for the next scale-out activity.
Application Auto Scaling provides a default value of 600 for Amazon ElastiCache replication groups and a default value of 300 for the following scalable targets:
For all other scalable targets, the default value is 0:
ScaleInCooldown (integer) --
The amount of time, in seconds, after a scale-in activity completes before another scale-in activity can start.
With the scale-in cooldown period , 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 scale-in cooldown period, Application Auto Scaling scales out the target immediately. In this case, the scale-in cooldown period stops and doesn't complete.
Application Auto Scaling provides a default value of 600 for Amazon ElastiCache replication groups and a default value of 300 for the following scalable targets:
For all other scalable targets, the default value is 0:
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.
(dict) --
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 (datetime) --
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.
Exceptions
ApplicationAutoScaling.Client.exceptions.ValidationExceptionApplicationAutoScaling.Client.exceptions.FailedResourceAccessExceptionApplicationAutoScaling.Client.exceptions.InvalidNextTokenExceptionApplicationAutoScaling.Client.exceptions.ConcurrentUpdateExceptionApplicationAutoScaling.Client.exceptions.InternalServiceExceptionExamples
This example describes the scaling policies for the ECS service namespace.
response = client.describe_scaling_policies(
ServiceNamespace='ecs',
)
print(response)
Expected Output:
{
'NextToken': '',
'ScalingPolicies': [
{
'Alarms': [
{
'AlarmARN': 'arn:aws:cloudwatch:us-west-2:012345678910:alarm:web-app-cpu-gt-75',
'AlarmName': 'web-app-cpu-gt-75',
},
],
'CreationTime': datetime(2019, 5, 6, 12, 11, 39, 0, 126, 0),
'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',
'PolicyName': 'web-app-cpu-gt-75',
'PolicyType': 'StepScaling',
'ResourceId': 'service/default/web-app',
'ScalableDimension': 'ecs:service:DesiredCount',
'ServiceNamespace': 'ecs',
'StepScalingPolicyConfiguration': {
'AdjustmentType': 'PercentChangeInCapacity',
'Cooldown': 60,
'StepAdjustments': [
{
'MetricIntervalLowerBound': 0,
'ScalingAdjustment': 200,
},
],
},
},
],
'ResponseMetadata': {
'...': '...',
},
}