On joinmastodon.org what makes an instance Intermittent vs Stable? I mean specifically, not generically?
It looks to me that instances.social regularly checks whether the instance is up and down.
Then the uptime ratio is calculated:
hel.upchecks / (hel.upchecks + hel.downchecks)
The fronted treats instances with the uptime ration less or requal 50% as
awful, until 95% as
intermittent and above that as