systemd-tmpfiles --clean enabled by default - 21/11/2022 00:00 GMT

Starting with sys-apps/systemd-utils-251.8-r1, a script is installed in
/etc/cron.daily to run "systemd-tmpfiles --clean" once per day. This
will remove stale temp files based on settings specified in tmpfiles.d.

This change is meant to mimic the behavior of
systemd-tmpfiles-clean.timer from systemd on systems running OpenRC.

If you wish to opt-out, simply comment out the command in
/etc/cron.daily/systemd-tmpfiles-clean.