For some unknown reason Munin stops recording IP traffic after I do ISPConfig 3 updates. It's happened the last 3 or so updates. Restarting munin, networking or the individual server programs doesn't help. Rebooting the server gets it going again. (No question, just a note for the general knowledge base).
No errors in logs. No changes in the directory permissions when it's running and when it's not. All the other munin monitoring plugins work. Only the IP traffic stops until the server is rebooted.
