[tor-relays] Way to be notified when relay goes offline?

[mpan]

> Is there a way to be notified when a relay goes offline?
Hello,

   If your relay is running as a systemd service, you may add any action 
to ExecStopPost.⁽¹⁾ That includes sending an email or any other means of 
notification.

Cheers
____
⁽¹⁾ 
https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html#ExecStopPost=