Happy to report, that tor-controlport-filter learned sd_notify, now got
support for systemd's watchdog feature. Using python3-sdnotify from
packages.debian.org.
To be found in git master. Git commits, test results can be found here.
https://phabricator.whonix.org/T274#12423
https://github.com/Whonix/control-port-filter-python
Cheers,
Patrick