My tor relay's went offline and needed to be rebooted. I noticed they were off when I checked their status on atlas.torproject.org. The hosting provider is cheap/unreliable so I'm not surprised they went offline, though I wonder what I can do to make it less likely or get them to self-recover.

A while ago I installed a MQTT dashboard, but haven't put it to use yet and I wonder that is a good way to monitor server status.
https://www.hivemq.com/blog/mqtt-essentials-part-10-alive-client-take-over/