This topic describes the system events of ApsaraDB for MongoDB.

Type Event Description State Level
Exception Instance_Failure_End The instance failure ends. Executed Critical
Exception Instance_Failure_Start The instance failure starts. Executing Critical
Maintenance Instance:SystemMaintenance.ScheduledOperation:Scheduled The operations and maintenance (O&M) operation on the instance is scheduled. Scheduled Warn
Maintenance Instance:SystemMaintenance.ScheduledOperation:Executing The O&M operation on the instance is being performed. Executing Warn
Maintenance nstance:SystemMaintenance.ScheduledOperation:Executed The O&M operation on the instance is performed. Executed Warn
Maintenance Instance:SystemMaintenance.ScheduledOperation:Canceled The O&M operation on the instance is canceled. Canceled Warn
InstanceMaintenance Instance_Failover The failure-triggered switchover between the primary instance and secondary instance starts. Executed Warn
InstanceMaintenance Instance_Switchover The task-triggered switchover between the primary instance and secondary instance starts. Executed Warn