Where'd the OOM logs go in CentOS7 (systemd)?

This seems like a question that should be easy but has me completely stumped.

I have a CentOS7 server that I know for a fact is OOMing (it's a container, and you can see from the node that it's OOMing because the node is still CentOS5, so grepping for "memory" in /var/log/messages still gives results), but there is absolutely no mention of it in /var/log/messages. Where did those logs go? I tried a couple of things from vaguely-related Google searches, but so far no dice. What am I missing? What else got moved out of /var/log/messages?