This was one of my questions for @gkistanova in D143172, and it feels like it would be worth recording the answer in our documentation.
It would probably be good to record the same information for the main buildmaster, but I'm not sure of the answer here (is this only updated at the times when @gkistanova sends out the notifications about the buildmaster being restarted? Or is that something separate?).
Obviously very happy to iterate on this to add in more such information, or to find a better place for it.