Auto Scaling events-阿里云帮助中心

This topic describes the event types that Auto Scaling publishes to EventBridge. As an event source, Auto Scaling integrates with ActionTrail, CloudMonitor, and Cloud Config.

Event types

Auto Scaling can publish the following event types to EventBridge.

Event type	Value of the type parameter
Scale-in activity failed	ess:ScalingActivity:ScaleInError
Scale-in activity partially successful	ess:ScalingActivity:ScaleInPartialSuccess
Scale-in activity successful	ess:ScalingActivity:ScaleInSuccess
Scale-out activity failed	ess:ScalingActivity:ScaleOutError
Scale-out activity partially successful	ess:ScalingActivity:ScaleOutPartialSuccess
Scale-out activity successful	ess:ScalingActivity:ScaleOutSuccess
Scale-in lifecycle hook	ess:LifecycleHook:ScaleIn
Scale-out lifecycle hook	ess:LifecycleHook:ScaleOut
EventBridge lifecycle hook test event	ess:LifecycleHook:Test
Scale-in activity started	ess:ScalingActivity:ScaleInStart
Scale-out activity started	ess:ScalingActivity:ScaleOutStart
Management events that the Alibaba Cloud platform performs on resources	ess:ActionTrail:AliyunServiceEvent
API call	ess:ActionTrail:ApiCall
Console operation event	ess:ActionTrail:ConsoleOperation
Scaling group scale-in activity failed	ess:CloudMonitor:AUTOSCALING[SCALEINERROR]
Scaling group scale-in activity started	ess:CloudMonitor:AUTOSCALING[SCALEINSTART]
Scaling group scale-in activity successful	ess:CloudMonitor:AUTOSCALING[SCALEINSUCCESS]
Scaling group scale-in activity partially successful	ess:CloudMonitor:AUTOSCALING[SCALEINWARN]
Scaling group scale-out activity failed	ess:CloudMonitor:AUTOSCALING[SCALEOUTERROR]
Scaling group scale-out activity started	ess:CloudMonitor:AUTOSCALING[SCALEOUTSTART]
Scaling group scale-out activity successful	ess:CloudMonitor:AUTOSCALING[SCALEOUTSUCCESS]
Scaling group scale-out activity partially successful	ess:CloudMonitor:AUTOSCALING[SCALEOUTWARN]
Scaling group activity execution rejected	ess:CloudMonitor:AUTOSCALING[SCALEREJECT]
Scheduled task expiration reminder	ess:CloudMonitor:AUTOSCALING[SCHEDULETASKEXPIRING]
Resource change delivery	ess:Config:ConfigurationItemChangeNotification
Non-compliance notification for resource evaluation	ess:Config:NonCompliantNotification

For more information about the parameters defined in the CloudEvents specification, see Overview.

Scale-in activity failed

The following is a sample event that EventBridge receives when a scale-in activity fails.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleInError",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"1\" to \"0\".",
    "description": "Fail to remove Instances \"i-xxx\" (code:\"LifecycleActionResult.Abandon\", msg:\"Abandon lifecycleActionResult parameter caused the instance to rollback.\").",
    "startTime": "2022-09-06T06:29:23.000Z",
    "endTime": "2022-09-06T06:30:10.000Z",
    "expectNum": 1,
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 1
  }
}

The parameters in the data field are described in the following table.

Parameter	Type	Example	Description
cause	String	`A user changed the Desired Capacity, changing the Total Capacity from \"1\" to \"0\"."`	The reason why the scaling activity was triggered.
description	String	Fail to remove Instances \"i-xxx\" (code:\"LifecycleActionResult.Abandon\", msg:\"Abandon lifecycleActionResult parameter caused the instance to rollback.\")."	The description of the scaling activity.
startTime	String	2022-09-06T06:29:23.000Z	The start time of the scaling activity.
endTime	String	2022-09-06T06:30:10.000Z	The end time of the scaling activity.
expectNum	Int	1	The expected capacity value for a scale-out scaling activity.
requestId	String	WOSQ2zMxNTcZOoH1b****	The request ID.
scalingActivityId	String	asa-xxx	The ID of the scaling activity.
totalCapacity	String	1	The capacity of the group after the scaling activity is complete.

Scale-in activity partially successful

The following is a sample event that EventBridge receives when a scale-in activity is partially successful.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleInPartialSuccess",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"2\" to \"0\".",
    "description": "\"1\" ECS instances are removed",
    "startTime": "2022-09-06T06:29:23.000Z",
    "endTime": "2022-09-06T06:30:10.000Z",
    "expectNum": 1,
    "instanceIds": [
      "i-xxx"
    ],
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 1
  }
}

The parameters in the data field are described in the following table.

Parameter	Type	Example	Description
cause	String	`A user changed the Desired Capacity, changing the Total Capacity from \"1\" to \"0\"."`	The reason why the scaling activity was triggered.
description	String	Fail to remove Instances \"i-xxx\" (code:\"LifecycleActionResult.Abandon\", msg:\"Abandon lifecycleActionResult parameter caused the instance to rollback.\")."	The description of the scaling activity.
startTime	String	2022-09-06T06:29:23.000Z	The start time of the scaling activity.
endTime	String	2022-09-06T06:30:10.000Z	The end time of the scaling activity.
expectNum	Int	1	Specifies the expected capacity value for the scale-out.
requestId	String	WOSQ2zMxNTcZOoH1bu****	The request ID.
scalingActivityId	String	asa-xxx	The ID of the scaling activity.
instanceIds	Array	i-xxx	A list of instance IDs that were removed.
totalCapacity	Int	1	The capacity of the group after the scaling activity is complete.

Scale-in activity successful

The following is a sample event that EventBridge receives when a scale-in activity is successful.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleInSuccess",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"1\" to \"0\".",
    "description": "\"1\" ECS instances are removed",
    "startTime": "2022-09-06T06:29:23.000Z",
    "endTime": "2022-09-06T06:30:10.000Z",
    "expectNum": 1,
    "instanceIds": [
      "i-xxx"
    ],
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 0
  }
}

For descriptions of the parameters in the data field, see Parameter descriptions.

Scale-out activity failed

The following is a sample event that EventBridge receives when a scale-out activity fails.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleOutError",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"0\" to \"1\".",
    "description": "Fail to create Instances into scaling group(code:\"LifecycleActionResult.Abandon\", msg:\"Abandon lifecycleActionResult parameter caused the instance to rollback.\").",
    "startTime": "2022-09-06T06:29:23.000Z",
    "endTime": "2022-09-06T06:30:10.000Z",
    "expectNum": 1,
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 0
  }
}

For descriptions of the parameters in the data field, see Parameter descriptions.

Scale-out activity partially successful

The following is a sample event that EventBridge receives when a scale-out activity is partially successful.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleOutPartialSuccess",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"0\" to \"2\".",
    "description": "\"1\" ECS instances are added",
    "startTime": "2022-09-06T06:29:23.000Z",
    "endTime": "2022-09-06T06:30:10.000Z",
    "expectNum": 2,
    "instanceIds": [
      "i-xxx"
    ],
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 1
  }
}

For descriptions of the parameters in the data field, see Parameter descriptions.

Scale-out activity successful

The following is a sample event that EventBridge receives when a scale-out activity is successful.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleOutSuccess",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"0\" to \"1\".",
    "description": "\"1\" ECS instances are added",
    "startTime": "2022-09-06T06:29:23.000Z",
    "endTime": "2022-09-06T06:30:10.000Z",
    "expectNum": 1,
    "instanceIds": [
      "i-xxx"
    ],
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 1
  }
}

For descriptions of the parameters in the data field, see Parameter descriptions.

Scale-in lifecycle hook

The following is a sample event that EventBridge receives for a scale-in lifecycle hook.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2023-05-19T21:04:41Z",
  "type": "ess:LifecycleHook:ScaleIn",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2023-05-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "instanceIds": [
      "i-xxx"
    ],
    "lifecycleHookId": "ash-xxx",
    "lifecycleActionToken": "XXXX",
    "scalingGroupId": "asg-xxx",
    "scalingActivityId": "asa-xxx",
    "notificationMetadata": "lifecycleHook metadata example",
    "defaultResult": "CONTINUE"
  }
}

The parameters in the data field are described in the following table.

Parameter	Type	Example	Description
instanceIds	Array	[ "i-xxx" ]	A list of IDs for the instances being removed.
lifecycleHookId	String	ash-xxx	The ID of the lifecycle hook.
lifecycleActionToken	String	XXXX	The identifier for the pending state of the scaling activity.
scalingGroupId	String	asg-xxx	The ID of the scaling group.
scalingActivityId	String	asa-xxx	The ID of the scaling activity.
notificationMetadata	String	lifecycleHook metadata example	The notification information for the lifecycle hook.
defaultResult	String	CONTINUE	The default result of the lifecycle hook. Valid values: CONTINUE: Continues the response to the scale-out or scale-in activity. ABANDON: Directly releases the ECS instances created during a scale-out activity, or directly removes the ECS instances from the scaling group during a scale-in activity. ROLLBACK: For a scale-in activity, this rejects the release of the ECS instances and performs a rollback. For a scale-out activity, this directly releases the created ECS instances, which has the same effect as ABANDON.

Scale-out lifecycle hook

The following is a sample event that EventBridge receives for a scale-out lifecycle hook.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2023-05-19T21:04:41Z",
  "type": "ess:LifecycleHook:ScaleOut",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2023-05-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "instanceIds": [
      "i-xxx"
    ],
    "lifecycleHookId": "ash-xxx",
    "lifecycleActionToken": "XXXX",
    "scalingGroupId": "asg-xxx",
    "scalingActivityId": "asa-xxx",
    "notificationMetadata": "lifecycleHook metadata example",
    "defaultResult": "CONTINUE"
  }
}

For descriptions of the parameters in the data field, see Parameter descriptions.

EventBridge lifecycle hook test event

The following is a sample event that EventBridge receives when an EventBridge lifecycle hook test event is pushed.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2023-05-19T21:04:41Z",
  "type": "ess:LifecycleHook:Test",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2023-05-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "scalingGroupId": "asg-xxx"
  }
}

For descriptions of the parameters in the data field, see Parameter descriptions.

Scale-in activity started

The following is a sample event that EventBridge receives when a scale-in activity starts.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleInStart",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"1\" to \"0\".",
    "description": "\"1\" ECS instances are removed",
    "startTime": "2022-09-06T06:29:23.000Z",
    "expectNum": 1,
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 1
  }
}

The parameters in the data field are described in the following table.

Parameter	Type	Example value	Description
cause	string	A user changed the Desired Capacity, changing the Total Capacity from \"1\" to \"0\".	The reason why the scaling activity was triggered.
description	string	\"1\" ECS instances are removed"	The description of the scaling activity.
startTime	string	2022-09-06T06:29:23.000Z	The start time of the scaling activity.
expectNum	Int	1	The expected capacity to be removed by the scaling activity.
requestId	string	WOSQ2zMxNTcZOoH1bu****	The request ID of the scaling activity.
scalingActivityId	string	asa-xxx	The ID of the scaling activity.
totalCapacity	Int	1	The capacity of the group after the scaling activity is complete.

Scale-out activity started

The following is a sample event that EventBridge receives when a scale-out activity starts.

{
  "id": "45ef4dewdwe1-7c35-447a-bd93-fab****",
  "source": "acs.ess",
  "specversion": "1.0",
  "subject": "arn:acs:ess:cn-hangzhou:123456789xxxxxxx:scalinggroup/asg-xxxxx",
  "time": "2020-11-19T21:04:41Z",
  "type": "ess:ScalingActivity:ScaleOutStart",
  "aliyunaccountid": "123456789098****",
  "aliyunpublishtime": "2020-11-19T21:04:42Z",
  "aliyuneventbusname": "default",
  "aliyunregionid": "cn-hangzhou",
  "aliyunpublishaddr": "172.25.XX.XX",
  "data": {
    "cause": "A user changed the Desired Capacity, changing the Total Capacity from \"0\" to \"2\".",
    "description": "\"1\" ECS instances are added",
    "startTime": "2022-09-06T06:29:23.000Z",
    "expectNum": 2,
    "requestId": "WOSQ2zMxNTcZOoH1bu****",
    "scalingActivityId": "asa-xxx",
    "totalCapacity": 1
  }
}

For descriptions of the parameters in the data field, see Parameter descriptions.