Re: misc.legal.moderated

OK, I've updated both of the moderator relays under my
control so an alert will be raised if there's a gap of more
than 7 hours without any messages successfully being relayed
or there are an excessive number of temporary DNS resolution
failures within the past hour.

The 7-hour threshold was determined empirically, i.e., I
looked at old logs and figured out the longest gap we've
observed in recent history. It may have to be adjusted up if
it turns out it's too optimistic about the frequency of
submissions.

For those who are curious:

https://github.com/jikamens/ansible-usenet-mod-relay/commit/0b53daf62c070eac0319f70d4937d1aaba5de9b0