How do you monitor the tor relay server and the relay itself, on a remote box?
I like https://www.statuscake.com/ for this and their free plan is sufficient. I'm not affiliated with them, I just like the service. It constantly checks for a response from both the Dir and OR ports of my relays, using monitoring endpoints around the world, and notifies me of downtime. It also has a nice feature where it can look for a specific response from the Dir port (i.e, parse http://relay1.example.com/tor/server/authority and make sure the fingerprint matches).