logging is probably down

You do, of course have a dedicated rsyslogd server? An isolated system to which logs are sent, so that if someone compromises another one of your systems, they can't wipe traces of that compromise from those systems?

Oh. You don't. Well, that's okay. Not every lab can be complete. That Raspberry Pi over there in the corner isn't actually doing anything, but it's probably happy where it is. You know, being off, not doing anything.