[tor-dev] Network Health Monitoring

[Iain Learmonth]

Hi All,

I'm working on #28322 to improve the monitoring of Tor Metrics services,
but this also has the side effect of monitoring network health. For
example, we'd like to know when Onionoo messes up and starts reporting
zero relays, but we also get to learn for free in the same check how
many relays we have and alert if that number does something weird.

What would be the most useful checks to add here?

* Range of expected total relays
* Range of expected relays with Guard flag
* Range of expected relays with Exit flag
* Range of expected consensus weight in each position

Each one of these is basically an if statement in the script so I'm
happy to add these. I can do this by trial and error but if someone has
already thought about it then please reply or comment on the ticket.

Thanks,
Iain.

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