I finally got some time to work on this issue. When I try to delete the "orphaned" datapoint I get the following error in the UI.
Error deleting data point: Internal Server Error — com.serotonin.ShouldNeverHappenException: java.lang.IllegalArgumentException: Invalid enum value
What the data source and datapoint function is to receive a serial message from a moisture balance in the lab and email me the result. It worked great for over a year until I upgraded to 3.6.0 and that is when the Data Source disappeared.
I have tried to recreate both the Data Source and Data Point under different names, using the same regex expression to parse the serial message. So far I don't get anything logged in the data point results.
I do get the serial message logged in the /opt/mango/log/serialIO-x.log so I know the Mango server is getting the messages.
Any suggestions on how to trouble-shoot this would be appreciated.