If a specified system event occurs in Elastic Compute Service (ECS), CloudMonitor, ApsaraDB for OceanBase, and Web Application Firewall (WAF), CloudMonitor automatically sends alert notifications to the message recipients through Message Center.
The following table describes the system events for which CloudMonitor automatically
sends alert notifications.
| Alibaba Cloud service | Event type | Event name | Event description | Event status | Event severity |
|---|---|---|---|---|---|
| ECS | Exception | Instance:SystemFailure.Reboot:Executed | The instance reboot that is caused by a system error is completed. | Executed | Critical |
| StatusNotification | Instance:AutoReactivateCompleted | An ECS instance is automatically restarted. | Normal | Info | |
| Notification | Instance:TempBandwidthDowngrade | The temporary bandwidth of an ECS instance expires. | Normal | Info | |
| Exception | Disk:Stalled:Executed | The impact on the disk performance ends. | Executed | Critical | |
| Exception | Disk:Stalled:Executing | The impact on the disk performance starts. | Executing | Critical | |
| Exception | Instance:InstanceFailure.Reboot:Executed | The instance reboot that is caused by an instance error is completed. | Executed | Critical | |
| Exception | Instance:SystemFailure.Reboot:Executing | The instance reboot that is caused by a system error starts. | Executing | Critical | |
| Maintenance | Instance:SystemMaintenance.IsolateErrorDisk:Inquiring | The damaged-disk isolation that is caused by system maintenance is waiting for your confirmation. | Inquiring | Critical | |
| Maintenance | Instance:SystemMaintenance.ReInitErrorDisk:Inquiring | The damaged-disk reinitialization that is caused by system maintenance is waiting for your confirmation. | Inquiring | Critical | |
| Maintenance | Instance:SystemMaintenance.Reboot:Scheduled | The instance reboot that is caused by system maintenance is scheduled. | Scheduled | Critical | |
| Maintenance | Instance:SystemMaintenance.RebootAndIsolateErrorDisk:Inquiring | The instance reboot and damaged-disk isolation that are caused by system maintenance are waiting for your confirmation. | Inquiring | Critical | |
| Maintenance | Instance:SystemMaintenance.RebootAndReInitErrorDisk:Inquiring | The instance reboot and damaged-disk reinitialization that are caused by system maintenance are waiting for your confirmation. | Inquiring | Critical | |
| Maintenance | Instance:SystemMaintenance.Redeploy:Inquiring | The scheduled instance redeployment that is caused by system maintenance is waiting for your confirmation. | Inquiring | Critical | |
| Maintenance | Instance:SystemMaintenance.Redeploy:Scheduled | The instance redeployment that is caused by system maintenance is scheduled. | Scheduled | Critical | |
| Exception | Instance:SystemFailure.Stop:Executing | The instance stop that is caused by a system error starts. | Executing | Critical | |
| CloudMonitor | Alert | AlertWebHook | A callback event occurs. | Alarm | Info |
| ApsaraDB for OceanBase | StatusNotification | Instance:DataDisk:Full | The disk space of an ApsaraDB for OceanBase instance is insufficient. | Normal | Critical |
| WAF | Exceed | waf_event_qps_exceed | The queries per second (QPS) exceeds the threshold. | Overrun | Critical |
| Exceed | waf_event_bandwidth_exceed | The bandwidth exceeds the threshold. | Overrun | Critical |