ConstReadonlyAPI_CALL: "API_CALL"Started through an API call.
ReadonlyINFRASTRUCTURE_MAINTENANCE: "INFRASTRUCTURE_MAINTENANCE"Started for infrastructure maintenance reason.
ReadonlyJOB_TASK: "JOB_TASK"Started by the Jobs service.
ReadonlyRETRY_ON_FAILURE: "RETRY_ON_FAILURE"Started as a retry for a failed update.
ReadonlySCHEMA_CHANGE: "SCHEMA_CHANGE"Started as a result of a schema change.
ReadonlySERVICE_UPGRADE: "SERVICE_UPGRADE"Started as a result of a service upgrade.
ReadonlyUSER_ACTION: "USER_ACTION"Started by an action a user performed.
What triggered this update.