Googling for a solution, I only found articles telling me how to do it in old systems and not under a systemd maintained Linux, by changing the cron init-script adding -L parameter to the command line.

I have a cron job that runs every minute. It logs every start and additionall a pam\_unix-entry for each session opened and closed for the user running cron. This is a lot of babbeling in the journald log. How can I set the log level in a systemd-environment, that I only get errors and fatalities documented?