Hi, googling for the error message leads me to #857904 which has the same error with apache2. This turned out that systemd.log_level=debug was set in /etc/default/grub. That one should also show up in /proc/cmdline. And you should get this blurb every time a systemctl call is executed, for example when logrotate rotates a log and kicks the daemon later.
Atop is a likely culprit for that as it's restarted every night. If this is the case then my first assessment that you're running in some debug mode is true. The systemd log level can also be set in the [Manager] section of /etc/systemd/system.conf Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402 Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421