I am hosting a selfoss 2.18 installation on nearlyfreespeech.net. When I set the logger_level to NONE, cron outputs for the cliupdate.php seem to default to DEBUG. All the other options for logger_level run at the appropriate levels.

My cron line is like so:

/usr/local/bin/php7.2 /home/public/cliupdate.php

Let me know if you need other info.