After upgrade to TOS5.1 I can see these foris related errors in logs when working in both old Foris as well as reForis.
Aug 29 07:37:55 omnia foris-controller[6721]: ERROR:foris_controller_backends.files:Failed to parse content of the file '/proc/cmdline'
The content of /proc/cmdline is:
earlyprintk console=ttyS0,115200 rootfstype=btrfs rootdelay=2 root=b301 rootflags=subvol=@,commit=5 rw cfg80211.freg=**
I cannot see any impact to functionality - just annoying to see the entries in log.