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Showing content from https://docs.aws.amazon.com/sdkforruby/api/Aws/ApplicationAutoScaling/Client.html below:

Client — AWS SDK for Ruby V2

Examples:

Example: To apply a target tracking scaling policy with a predefined metric specification

resp = client.put_scaling_policy({
  policy_name: "cpu75-target-tracking-scaling-policy", 
  policy_type: "TargetTrackingScaling", 
  resource_id: "service/default/web-app", 
  scalable_dimension: "ecs:service:DesiredCount", 
  service_namespace: "ecs", 
  target_tracking_scaling_policy_configuration: {
    predefined_metric_specification: {
      predefined_metric_type: "ECSServiceAverageCPUUtilization", 
    }, 
    scale_in_cooldown: 60, 
    scale_out_cooldown: 60, 
    target_value: 75, 
  }, 
})

{
  alarms: [
    {
      alarm_arn: "arn:aws:cloudwatch:us-west-2:012345678910:alarm:TargetTracking-service/default/web-app-AlarmHigh-d4f0770c-b46e-434a-a60f-3b36d653feca", 
      alarm_name: "TargetTracking-service/default/web-app-AlarmHigh-d4f0770c-b46e-434a-a60f-3b36d653feca", 
    }, 
    {
      alarm_arn: "arn:aws:cloudwatch:us-west-2:012345678910:alarm:TargetTracking-service/default/web-app-AlarmLow-1b437334-d19b-4a63-a812-6c67aaf2910d", 
      alarm_name: "TargetTracking-service/default/web-app-AlarmLow-1b437334-d19b-4a63-a812-6c67aaf2910d", 
    }, 
  ], 
  policy_arn: "arn:aws:autoscaling:us-west-2:012345678910:scalingPolicy:6d8972f3-efc8-437c-92d1-6270f29a66e7:resource/ecs/service/default/web-app:policyName/cpu75-target-tracking-scaling-policy", 
}

Request syntax with placeholder values

resp = client.put_scaling_policy({
  policy_name: "PolicyName",   service_namespace: "ecs",   resource_id: "ResourceIdMaxLen1600",   scalable_dimension: "ecs:service:DesiredCount",   policy_type: "StepScaling",   step_scaling_policy_configuration: {
    adjustment_type: "ChangeInCapacity",     step_adjustments: [
      {
        metric_interval_lower_bound: 1.0,
        metric_interval_upper_bound: 1.0,
        scaling_adjustment: 1,       },
    ],
    min_adjustment_magnitude: 1,
    cooldown: 1,
    metric_aggregation_type: "Average",   },
  target_tracking_scaling_policy_configuration: {
    target_value: 1.0,     predefined_metric_specification: {
      predefined_metric_type: "DynamoDBReadCapacityUtilization",       resource_label: "ResourceLabel",
    },
    customized_metric_specification: {
      metric_name: "MetricName",       namespace: "MetricNamespace",       dimensions: [
        {
          name: "MetricDimensionName",           value: "MetricDimensionValue",         },
      ],
      statistic: "Average",       unit: "MetricUnit",
    },
    scale_out_cooldown: 1,
    scale_in_cooldown: 1,
    disable_scale_in: false,
  },
})

Response structure

resp.policy_arn resp.alarms resp.alarms[0].alarm_name resp.alarms[0].alarm_arn 

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