docker: no memory stats available

Hey,

it seems like docker cannot determine the memory usage of the containers: Example output of docker stats:

CONTAINER ID   NAME                CPU %     MEM USAGE / LIMIT   MEM %     NET I/O          BLOCK I/O   PIDS
c0a38377464a   kind_gould          0.13%     0B / 0B             0.00%     1.9kB / 726B     0B / 0B     38

rc_cgroup_mode="unified" is set in /etc/rc.conf and the cgroups service is enabled and running.

I set also the cmdline parameters group_enable=cpuset cgroup_enable=memory cgroup_memory=1 , but still no luck.