Failed to parse content of the file '/proc/cmdline'

Foris controller repeatedly writes to the system log:

ERROR:foris_controller_backends.files:Failed to parse content of the file '/proc/cmdline'

It occurs both on a system installed from another versions via switch-branch and on a cleanly installed system (from a medkit).

Affected versions: 5.1.0 and newer (possibly older versions too but not tested)

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