Kubelet failed to get system container stats

[nuriel77]

It seems that running kubelet with runc makes it impossible to access container stats.

May 31 07:24:05 atomictest-4 runc[3945]: E0531 07:24:05.036706    3953 summary.go:92] Failed to get system container stats for "/system.slice": failed to get cgroup stats for "/system.slice": failed to get container info for "/system.slice": unknown container "/system.slice"

I tried to run kubelet directly (not via runc) /var/lib/containers/atomic/kubelet.0/rootfs/usr/bin/kubelet with the same command line argument and then it can access container stats.

It seems to me that when running with runc it cannot access host system /sys/fs/cgroup/systemd/system.slice which is necessary to collect container stats.