> systemd have a watchdog feature 
> 
> http://man7.org/linux/man-pages/man3/sd_watchdog_enabled.3.html
> 
> which could be great for some services, like pvestatd. (which sometimes can
> freeze which slow/bad storage stats)

Unfortunately, a restart does not help in that case?

> The idea is that the application need to send notifify at regular interval to
> systemd,

I already played around with that feature, but AFAIK it needs /dev/watchdog? Or
does it
work without opening /dev/watchdog?

/dev/watchdog can be used only once, and I have other plans for it (ha soft
fence).

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