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Elastic Compute Service

Event monitoring

Event monitoring overview

Event monitoring is used to record ECS instance information and send notifications. When an instance or task triggers a system event (such as a system failure that leads to instance redeployment), you can promptly view the event details and take actions.

Event state

Event state descriptions:

Status	Console display	Attribute	Description
Inquiring	Inquiring	Intermediate state	This event is in inquiry and waiting for your authorization. After your authorization is obtained, this event will change to "Executing" status.
Scheduled	Scheduled	Intermediate state	The O&M task is scheduled for execution but has not started yet. After the task starts, it will enter the "Executing" status.
Executing	Executing	Intermediate state	The O&M task is in progress.
Pending	Pending	Intermediate state	The O&M task has been paused.
Recovered	Recovered	Intermediate state	The O&M task has resumed.
Succeeded	Succeeded	Stable state	The O&M task has been completed.
Rejected	User refuses to execute	Stable state	If you manually refuse authorization, the O&M task will not be conducted.
Failed	Failed	Stable state	The O&M task failed.
Canceled	Cancel	Stable state	The system canceled the O&M task.

Diagram of general event state changes

Event types and event naming rules

Event types and event names follow fixed naming rules. After understanding the naming rules, you can quickly understand what an event means through its name. The naming formats are as follows:

Event type: <event cause>.<impact on the resource>

For example, SystemFailure.Reboot means that the ECS instance restarts due to a host machine failure.

Event name: <event cause>.<impact on the resource>:<event state>

For example: SystemFailure.Reboot:Succeeded means that the ECS instance was restarted due to a host machine failure, and the event status is "Succeeded".

tip

For information about currently supported events, such as the type, state, name, and recommended action, refer to Event type overview.

Query and handle events

You can query and handle events in the console and through OpenAPI. For more details, refer to Querying and handling events.

System event maintenance

You can use the O&M feature to have O&M operations automatically performed based on your configurations for the instance that triggers a specified system event. This helps improve ECS instance stability and reduce O&M costs. For details, refer to Configuring automatic O&M for system events.

tip

This feature is in Beta. If you need a trial, please contact your account manager.

Receiving event notifications

When an ECS instance triggers a monitoring event, the event notification can be sent to you via Message Center and Cloud Monitor. Learn more.

Last updated: 2026.06.18 17:49:50