I would guess that for some reason loglevel is DEBUG, could that be the case?

Yes it is. They come always for us. Even if there is no matplotlib in requirements

We are using matplotlib in some tasks

are you using matplotlib ? could it be the binding check if matplotlib exists ? could it be you are running it with DEBUG on (i.e. global log level debug) ?

StraightDog31 how did you get these ?
It seems like it is coming from maptplotlib, no?