Mentat

After a machine reboot the owner of /var/run/warden_filer/ is root and the user mentat has no write permissions there, what effectively prevents the warden-filer from starting correctly (the receiver.pid file cannot be created). Also, systemctl reports the process as started even though the log contains errors (so monitoring is probably not alerted of the issue).
A simple owner change of the said path to mentat:mentat and subsequent warden_filer_receiver.service restart solves the issue (permission change is probably a preferable way to fix this).
This was confirmed on both mentat-hub and mentat-alt.