EVENT_CHECKING_PERIODIC = 'checking-periodic'
EVENT_ERROR_DEQUEUEING = 'error-dequeueing'
EVENT_ERROR_ENQUEUEING = 'error-enqueueing'
EVENT_ERROR_INTERNAL = 'error-internal'
EVENT_ERROR_SCHEDULING = 'error-scheduling'
EVENT_ERROR_STORING_RESULT = 'error-storing-result'
EVENT_ERROR_TASK = 'error-task'
EVENT_LOCKED = 'locked'
EVENT_FINISHED = 'finished'
EVENT_RETRYING = 'retrying'
EVENT_REVOKED = 'revoked'
EVENT_SCHEDULED = 'scheduled'
EVENT_SCHEDULING_PERIODIC = 'scheduling-periodic'
EVENT_STARTED = 'started'
EVENT_TIMEOUT = 'timeout'
