One of our VM hosts in London has killed its own networking process, causing hosts on that server to become unreachable.
Apr 30 10:30:04 cg kernel: [56119873.560562] Out of memory: Kill process 1408 (ovs-vswitchd) score 114 or sacrifice child
Apr 30 10:30:04 cg kernel: [56119873.561390] Killed process 1408 (ovs-vswitchd) total-vm:3035596kB, anon-rss:421616kB, file-rss:9856kB, shmem-rss:0kB