Comment 4 for bug 1772236

Worth noting that we ran for many months before hitting this, and then:

ubuntu@juju-prod-ues-proposed-migration-machine-1:~$ dmesg -T | grep "Out of memory: Kill" | uniq
[Wed May 9 16:06:23 2018] Out of memory: Kill process 1408 (beam) score 215 or sacrifice child
[Sun May 20 03:58:24 2018] Out of memory: Kill process 19495 (beam) score 437 or sacrifice child
[Fri Jun 1 02:28:15 2018] Out of memory: Kill process 6569 (beam) score 428 or sacrifice child
[Fri Jun 8 05:37:54 2018] Out of memory: Kill process 1142 (beam) score 434 or sacrifice child

4 times in a month.

One thing that happened "sort of" around this time is

  https://launchpad.net/ubuntu/+source/erlang/1:18.3-dfsg-1ubuntu3.1

but I have a vague correlation here, no causation.

Does seem like rabbit's memory usage grows over time until it's eventually killed.