Errors are showing consistently in the logs when agents attempt to register "The handler 'GetClientTaskServers' is failed to process request. Called by unknown endpoint"
Int32 ReportEvent(Int32, System.String, System.String)
message: The handler 'GetClientTaskServers' is failed to process request. Called by unknown endpoint '00000000-0000-0000-0000-000000000000'.
The agents had recently been merged or imaged putting them in a state where they were not able to register with a Task Server.
This is just a nuisance message the agents will get a new guid and update tables as they check in after a merge or farther down an imaging process.