One of our add-ons is using the standard log4j .trace() logging in situations that write very low-level details (lower than something that you would consider debug()).
Some weeks ago we noticed that trace lines simply does not appear in the log. (I’m quite sure it was working previously.)
And it seems even the official documentation says:
TRACE - n/a within confluence
So, what do you do in case you want to use trace()?