I'm running the kubelet 1.5.4 and finding that even when I run low on disk space it will not delete old containers.

I have may exited containers, over an hour hold:

$ sudo docker ps -a | grep 'Exited (0) About an hour' | wc -l 78

But the kubelet does not seem to notice them (using a log level of 10 I see no references in kubelet logs to the container IDs).

Is this something that has changed recently? My previous 1.2 setup seemed to GC old containers.