This topic describes the system events for ApsaraDB for Redis.
| Type | Event | Description | State | Level |
|---|---|---|---|---|
| Maintenance | Instance_Failover | A failover occurs between the primary and secondary instances. | Executed | Warn |
| Exception | Instance_Failure_End | The instance failure ends. | Executed | Critical |
| Exception | Instance_Failure_Start | The instance failure starts. | Executing | Critical |