I'm not able to find any details that support what you're saying. It seems that in June Eric Brewer was still publicly asking for libcontainer to merge in LMCTFY support.
I definitely could be wrong, but looking at this screenshot from Eric's June talk it looks like they were still trying to get it merged:
https://pbs.twimg.com/media/B4DKb51CYAA687s.jpg:large
In June, Eric Brewer posted this:
We’ve released an open-source tool called cAdvisor that
enables fine-grain statistics on resource usage for containers.
It tracks both instantaneous and historical stats for a wide
variety of resources, handles nested containers, and supports
both LMCTFY and Docker’s libcontainer. It’s written in Go with
the hope that we can move some of these tools into libcontainer
directly if people find them useful (as we have).
http://googlecloudplatform.blogspot.com/2014/06/an-update-on...