Auto Scaling events - - Alibaba Cloud Documentation Center

This topic describes the types of Auto Scaling events that ActionTrail records or CloudMonitor or Cloud Config monitors and can be published to EventBridge.

Event types

The following table describes the types of Auto Scaling events that can be published to EventBridge.


Event type	Value of the type parameter
The scale-in activity of a scaling group fails	ess:ScalingActivity:ScaleInError
The scale-in activity of a scaling group is partially successful	ess:ScalingActivity:ScaleInPartialSuccess
The scale-in activity of a scaling group is partially successful	ess:ScalingActivity:ScaleInSuccess
The scale-out activity of a scaling group fails	ess:ScalingActivity:ScaleOutError
The scale-out activity of a scaling group is partially successful	ess:ScalingActivity:ScaleOutPartialSuccess
The scale-out activity of the scaling group is successful	ess:ScalingActivity:ScaleOutSuccess
Operation performed by Alibaba Cloud on a resource	ess:ActionTrail:AliyunServiceEvent
API operation call	ess:ActionTrail:ApiCall
Operation performed in a console	ess:ActionTrail:ConsoleOperation
The scale-in activity of a scaling group fails	ess:CloudMonitor:AUTOSCALING[SCALEINERROR]
The scale-in activity of a scaling group starts	ess:CloudMonitor:AUTOSCALING[SCALEINSTART]
The scale-in activity of a scaling group is successful	ess:CloudMonitor:AUTOSCALING[SCALEINSUCCESS]
The scale-in activity of a scaling group is partially successful	ess:CloudMonitor:AUTOSCALING[SCALEINWARN]
The scale-out activity of a scaling group fails	ess:CloudMonitor:AUTOSCALING[SCALEOUTERROR]
The scale-out activity of a scaling group starts	ess:CloudMonitor:AUTOSCALING[SCALEOUTSTART]
The scale-out activity of a scaling group is successful	ess:CloudMonitor:AUTOSCALING[SCALEOUTSUCCESS]
The scale-out activity of a scaling group is partially successful	ess:CloudMonitor:AUTOSCALING[SCALEOUTWARN]
The scaling activity of a scaling group is rejected	ess:CloudMonitor:AUTOSCALING[SCALEREJECT]
A scheduled task expires	ess:CloudMonitor:AUTOSCALING[SCHEDULETASKEXPIRING]
Resource change logs are delivered	ess:Config:ConfigurationItemChangeNotification
A notification that a resource is evaluated as non-compliant is sent	ess:Config:NonCompliantNotification

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

The scale-in activity of a scaling group fails

The following example shows the event that EventBridge receives when the scale-in activity of a scaling group 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 following table describes the parameters contained in data.


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 time when the scaling activity started.
endTime	String	2022-09-06T06:30:10.000Z	The time when the scaling activity ended.
expectNum	Int	1	The expected capacity of the scaling group after the scaling activity is completed.
requestId	String	WOSQ2zMxNTcZOoH1b****	The ID of the request.
scalingActivityId	String	asa-xxx	The ID of the scaling activity.
totalCapacity	String	1	The capacity of the scaling group after the scaling activity is completed.

The scale-in activity of a scaling group is partially successful

The following example shows the event that EventBridge receives when the scale-in activity of a scaling group 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 following table describes the parameters contained in data.


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 time when the scaling activity started.
endTime	String	2022-09-06T06:30:10.000Z	The time when the scaling activity ended.
expectNum	Int	1	The expected capacity of the scaling group after the scaling activity is complete.
requestId	String	WOSQ2zMxNTcZOoH1bu****	The ID of the request.
scalingActivityId	String	asa-xxx	The ID of the scaling activity.
instanceIds	Array	i-xxx	The IDs of the instances that you want to remove.
totalCapacity	Int	1	The capacity of the scaling group after the scaling activity is complete.

The scale-in activity of a scaling group is partially successful

The following example shows the event that EventBridge receives when the scale-in activity of a scaling group 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: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 information about the parameters contained in data, see the parameter description table.

The scale-out activity of a scaling group fails

The following example shows the event that EventBridge receives when the scale-out activity of a scaling group 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 information about the parameters contained in data, see the parameter description table.

The scale-out activity of a scaling group is partially successful

The following example shows the event that EventBridge receives when the scale-out activity of a scaling group 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 information about the parameters contained in data, see the parameter description table.

The scale-out activity of the scaling group is successful

The following example shows the event that EventBridge receives when the scale-out activity of the scaling group 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 information about the parameters contained in data, see the parameter description table.