David Goulet:
[snip]
There are two other overload lines that tor relay report: "overload-ratelimits" and "overload-fd-exhausted" but they are not used yet for the overload status on Metrics. But you can find them in your relay descriptor[0] if you are curious.
Small correction here: those two made it into the *extra-info* descriptors. Thus, you want to have a look at those[1] and not the server descriptors in case you want to figure out what is going on.
That said, I am currently working on network-health tools to get a better overview about relays' overload and I plan to contact all operators to help with configuration/tuning to avoid the overload we are seeing. I started with the "overload-fd-exhausted" condition as that is likely the easiest to fix and will get to the other ones once that one is resolved.
They are about when your relay reaches its connection global limit too often and when your relay runs out of file descriptors.
[snip]
Georg
[0]
https://collector.torproject.org/recent/relay-descriptors/server-descriptors...
[1] https://collector.torproject.org/recent/relay-descriptors/extra-infos/