Next week I'll be going offline for 3 weeks (two of them being really off the grid, I'm going to the European equivalent of the Burning Man festival...), so I'd like to check with you what errors I've seen our production Mailman3 instance do these last weeks.
I think that the main issue I haven't fixed yet is the fact that sometimes, for an unknown reason (yet), the archiving process dies, and email isn't archived anymore. The posts are still relayed to the subscribers, but the email are not archived. This can be detected by two ways:
* there is no running process called "/usr/bin/python3.4 /usr/libexec/mailman3/runner --runner=archive:0:1 -C /etc/mailman.cfg" (see the "runner" option on the command line)