This topic provides an overview of ECS event notifications. Event notifications provide information about resource changes. Notifications can be sent for the following events: system events (including O&M events and exceptions), instance status changes, events that data disks are attached or detached, and events that snapshots are created. Event notifications enable you to configure message-processing middleware for events to implement event-driven automated O&M in place of SDK polling.

Event notification name

After you configure notifications for events, you can receive the corresponding notifications if the events occur. The name field of a notification indicates the code name of the event. This field is in the following format: <resource type>:<event>:<status>.
  • <resource type>: the type of the corresponding ECS resource. Example values: Instance and Disk. Instance indicates ECS instance and Disk indicates Elastic Block Storage (EBS) device.
  • <event>: the name of the event. Example values: SystemMaintenance.Reboot, StateChange, PreemptibleInstanceInterruption, DiskOperationCompleted, and CreateSnapshotCompleted.
  • <status>: the status of the event. For the valid values of this field, see Overview.
    Note The <status> field is available only for system events related to instances and EBS devices.

Event notification format

After event notifications are configured, ECS sends the notifications based on the method that you specified. The following example shows a non-customized event notification in the JSON format. This notification is sent for the event that the status of an ECS instance changes.
Note If the notification method that you set supports format conversion, the notification that you receive may be converted to other formats. 
{
    "eventTime": "20181226T220114.058+0800",
    "id": "9435EAD6-3CF6-4494-8F7A-3A********77",
    "level": "INFO",
    "name": "Instance:StateChange",
    "product": "ECS",
    "regionId": "cn-hangzhou",
    "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
    "userId": "169070********30",
    "ver": "1.0",
    "content": {
        "resourceId": "i-bp1ecr********5go2go",
        "resourceType": "ALIYUN::ECS::Instance",
        "state": "Stopping"
    }
}
The following table describes fixed top-level fields in a notification.
Field Description Example
id The ID of the event. 9435EAD6-3CF6-4494-8F7A-3A********77
eventTime The time when the event occurred (UTC+8). 20181226T220114.058+0800
level The level of the event. Valid values:
  • INFO
  • WARN
  • CRITICAL
 INFO
name The name of the event. For more information, see the Event notification name section. Instance:StateChange
product The name of the service. Valid value: ECS. ECS
regionId The ID of the region where the event occurred. For the valid values of this field, see Regions and zones. cn-hangzhou
resourceId The Alibaba Cloud Resource Name (ARN) of the resource. acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go
userId The ID of the Alibaba Cloud account. 169070********30
content The event details. This field can contain one or more subfields. For more information about the subfields, see the following topics: None