Sometimes after maintenance event nothing is further logged. When user delete log files, logging will again works.
Automaintenance runs as user: www-data
CLI maintenance runs as a different user
The files are created (by default) with "rw-rr-" permission, they can only be written to by the owner.
The solution is to set the [log]filemode permission appropriatly in the conf file, these are in *nix octal format (so 0666 should work for anyone)