The PurgeScheduleHistoryQueue is used by external vaulting and content replication to track and clean up information about the old (outdated) schedules for revaulting and content replication. The queue contains only one object at a time.

A failed queue entry is an indication that old schedule histories could not be removed.

Checking for failed entries in this queue is not needed. If an entry in the queue is in a failed state, it will be recreated the next time the method server starts.