If you want some details on what’s going on with collabora and logging, there are some discussions here and there.
Personally I haven’t resolved the issue with collabora yet (didn’t have time to dig fully into it, but I’ll try reinstalling like @jarod5001 suggests may help).
In the meantime, the problematic service seems to be coolwsd, so running something like yunohost service stop coolwsd stops the crazyness with the logs.
If you don’t stop coolwsd, the basic cleanup yunohost command will just help you for a little while and you’ll get stuck again with the logs filling up again all the space that was freed with it.
On top of that, I had to manually remove some log files that were too huge, or split them in order no to loose all their content.