This morning I noticed an app we used (Task-Tracker) is not syncing. I logged into console and navigated to the App Services section->Logs and and am seeing a message
Synchronization between Atlas and Device Sync has been stopped, due to error:
encountered non-recoverable resume token error. Sync cannot be resumed from this state and must be terminated and re-enabled to continue functioning: (ChangeStreamHistoryLost) PlanExecutor error during aggregation :: caused by :: Resume of change stream was not possible, as the resume point may no longer be in the oplog.
With a button to Restart Atlas Sync. Pressing it comes back to the same vague error. I am working with Chat Support now and will circle back with any additional information.
Clear server generated errors and suggestions for corrective action would be really helpful as I have no idea what to do what that.