Log data of unit failures

Previous discussion Having to restart Emonhub to receive data from emonTH - #19 by pb66

No, emonhub handles it’s own log rotation and hard rotates at 500MB.

If you are running DEBUG, it rotates every couple of hours with a few interfacers running.

Actually it is here

Looking at this, do I detect that actually the size and log rotation count can be set in the emonhub settings? Undocumented feature?