This monitor detects if an event that is logged periodically is not detected. The rule associated with this monitor is "Log Distributed Workflow Test Event". If you disable the "Log Distributed Workflow Test Event" rule or configure too high of a threshold, it may cause this monitor to change state or generate an alert.
This can be caused if there is problem logging events to the Windows Event Log or if there is a problem reading and collecting this event from the Event Log.
Check if there are any script errors in the Operations Manager event log for the LogEndToEndEvent.ps1 script. This script logs the event that this monitor detects.
If there is no script error, check if there are any errors with the Windows Event Log Module having problems reading from the Operations Manager event log; this may be caused by the Action Account not having permissions to either write to or read from the event log.