{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/amazon-ec2-auto-scaling/refs/heads/main/json-structure/ec2-auto-scaling-lifecycle-hook-specification-structure.json",
  "name": "LifecycleHookSpecification",
  "description": "<p>Describes information used to specify a lifecycle hook for an Auto Scaling group.</p> <p>For more information, see <a href=\"https://docs.aws.amazon.com/autoscaling/ec2/userguide/lifecycle-hooks.html\">Amazon EC2 Auto Scaling lifecycle hooks</a> in the <i>Amazon EC2 Auto Scaling User Guide</i>.</p>",
  "type": "object",
  "properties": {
    "LifecycleHookName": {
      "allOf": [
        {
          "$ref": "#/components/schemas/AsciiStringMaxLen255"
        },
        {
          "description": "The name of the lifecycle hook."
        }
      ]
    },
    "LifecycleTransition": {
      "allOf": [
        {
          "$ref": "#/components/schemas/LifecycleTransition"
        },
        {
          "description": "<p>The lifecycle transition. For Auto Scaling groups, there are two major lifecycle transitions.</p> <ul> <li> <p>To create a lifecycle hook for scale-out events, specify <code>autoscaling:EC2_INSTANCE_LAUNCHING</code>.</p> </li> <li> <p>To create a lifecycle hook for scale-in events, specify <code>autoscaling:EC2_INSTANCE_TERMINATING</code>.</p> </li> </ul>"
        }
      ]
    },
    "NotificationMetadata": {
      "allOf": [
        {
          "$ref": "#/components/schemas/XmlStringMaxLen1023"
        },
        {
          "description": "Additional information that you want to include any time Amazon EC2 Auto Scaling sends a message to the notification target."
        }
      ]
    },
    "HeartbeatTimeout": {
      "allOf": [
        {
          "$ref": "#/components/schemas/HeartbeatTimeout"
        },
        {
          "description": "The maximum time, in seconds, that can elapse before the lifecycle hook times out. The range is from <code>30</code> to <code>7200</code> seconds. The default value is <code>3600</code> seconds (1 hour)."
        }
      ]
    },
    "DefaultResult": {
      "allOf": [
        {
          "$ref": "#/components/schemas/LifecycleActionResult"
        },
        {
          "description": "<p>The action the Auto Scaling group takes when the lifecycle hook timeout elapses or if an unexpected failure occurs. The default value is <code>ABANDON</code>.</p> <p>Valid values: <code>CONTINUE</code> | <code>ABANDON</code> </p>"
        }
      ]
    },
    "NotificationTargetARN": {
      "allOf": [
        {
          "$ref": "#/components/schemas/NotificationTargetResourceName"
        },
        {
          "description": "The Amazon Resource Name (ARN) of the notification target that Amazon EC2 Auto Scaling sends notifications to when an instance is in a wait state for the lifecycle hook. You can specify an Amazon SNS topic or an Amazon SQS queue."
        }
      ]
    },
    "RoleARN": {
      "allOf": [
        {
          "$ref": "#/components/schemas/XmlStringMaxLen255"
        },
        {
          "description": "<p>The ARN of the IAM role that allows the Auto Scaling group to publish to the specified notification target. For information about creating this role, see <a href=\"https://docs.aws.amazon.com/autoscaling/ec2/userguide/prepare-for-lifecycle-notifications.html#lifecycle-hook-notification-target\">Configure a notification target for a lifecycle hook</a> in the <i>Amazon EC2 Auto Scaling User Guide</i>.</p> <p>Valid only if the notification target is an Amazon SNS topic or an Amazon SQS queue.</p>"
        }
      ]
    }
  },
  "required": [
    "LifecycleHookName",
    "LifecycleTransition"
  ]
}