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
A scale-in activity failed	ess:ScalingActivity:ScaleInError
A scale-in activity is partially successful	ess:ScalingActivity:ScaleInPartialSuccess
A scale-in activity is successful	ess:ScalingActivity:ScaleInSuccess
A scale-out activity failed	ess:ScalingActivity:ScaleOutError
A scale-out activity is partially successful	ess:ScalingActivity:ScaleOutPartialSuccess
A scale-out activity is successful	ess:ScalingActivity:ScaleOutSuccess
A lifecycle hook for a scale-in activity is triggered	ess:LifecycleHook:ScaleIn
A lifecycle hook for a scale-out activity is triggered	ess:LifecycleHook:ScaleOut
A lifecycle hook test for EventBridge is triggered	ess:LifecycleHook:Test
A scale-in activity starts	ess:ScalingActivity:ScaleInStart
A scale-out activity starts	ess:ScalingActivity:ScaleOutStart
An operation is performed on a resource	ess:ActionTrail:AliyunServiceEvent
An API operation is called	ess:ActionTrail:ApiCall
An operation is performed in the console	ess:ActionTrail:ConsoleOperation
The scale-in activity of a scaling group failed	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 failed	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 indicates a resource is evaluated as non-compliant is delivered	ess:Config:NonCompliantNotification

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

A scale-in activity failed

The following example shows the event that EventBridge receives when a scale-in activity failed:

{
  "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 the data field.

Field	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 scale-in capacity of the 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 scaling group after the scaling activity is complete.

A scale-in activity is partially successful

The following example shows the 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 following table describes the parameters contained in the data field.

Field	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 scale-in capacity of the scaling activity.
requestId	String	WOSQ2zMxNTcZOoH1bu****	The request ID.
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.

A scale-in activity is successful

The following example shows the 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 information about the parameters contained in the data field, see the parameter description table.

A scale-out activity failed

The following example shows the event that EventBridge receives when a scale-out activity failed:

{
  "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 the data field, see the parameter description table.

A scale-out activity is partially successful

The following example shows the 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 information about the parameters contained in the data field, see the parameter description table.

A scale-out activity is successful

The following example shows the 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 information about the parameters contained in the data field, see the parameter description table.

A lifecycle hook for a scale-in activity is triggered

The following example shows the event that EventBridge receives when a lifecycle hook for a scale-in activity is triggered:

{
  "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 following table describes the parameters contained in the data field.

Field	Type	Example	Description
instanceIds	Array	[ "i-xxx" ]	The IDs of the instances that you want to remove.
lifecycleHookId	String	ash-xxx	The ID of the lifecycle hook.
lifecycleActionToken	String	XXXX	The action token of the lifecycle hook.
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 that is sent when the lifecycle hook takes effect.
defaultResult	String	CONTINUE	The default result of the lifecycle hook. Valid values: CONTINUE: Auto Scaling continues to respond to scale-in or scale-out requests. ABANDON: Auto Scaling releases Elastic Compute Service (ECS) instances during scale-out events, or removes ECS instances from the scaling group during scale-in events. ROLLBACK: During scale-in events, Auto Scaling declines requests to release ECS instances and rolls back changes. During scale-out events, the ROLLBACK setting behaves identically to the ABANDON setting.

A lifecycle hook for a scale-out activity is triggered

The following example shows the event that EventBridge receives when a lifecycle hook for a scale-out activity is triggered:

{
  "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 information about the parameters contained in the data field, see the parameter description table.

A lifecycle hook test for EventBridge is triggered

The following example shows the event that EventBridge receives when a lifecycle hook test for EventBridge is triggered:

{
  "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 information about the parameters contained in the data field, see the parameter description table.

A scale-in activity starts

The following example shows the 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 following table describes the parameters contained in the data field.

Field	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	\"1\" ECS instances are removed"	The description of the scaling activity.
startTime	string	2022-09-06T06:29:23.000Z	The time when the scaling activity started.
expectNum	Int	1	The expected scale-in capacity of 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 scaling group after the scaling activity is complete.

A scale-out activity starts

The following example shows the 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 information about the parameters contained in the data field, see the parameter description table.