Let’s say that around 8pm you noticed that your linode is suffering from a lack of memory. And so you decide that the Mailman processes have gotten bloated and need to be restarted. So you do an
/etc/init.d/mailman restart. And let’s further say that as you’re heading off to bed 2 hours later, you still haven’t gotten any messages from any of the mailing lists on that server.
- Assume that everybody suddenly got real quiet, and head off to bed without a second thought? or
- Assume that the restart didn’t actually restart, and send a test message to one of the list-request addresses, and when it doesn’t come back, do another mailman restart?
Because last night, I did the first one, and didn’t do the second one until this morning. Which is why on these graphs you’ll see no activity for 11 hours, and then suddenly a big spike.