Running cgroups stats functionality within k8s

[chapmanc]

I apologize in advance for my lack of knowledge here but I am trying to do a POC to gather stats about a container within the container and was hoping to use this library to do so but looking at the load function it seems to reference that I need a specific cgroup to load:

// Load will load an existing cgroup and allow it to be controlled
// All static path should not include `/sys/fs/cgroup/` prefix, it should start with your own cgroups name
func Load(path Path, opts ...InitOpts) (Cgroup, error) {

Inside my container (vanilla alpine) I have just the running process itself so I assumed I could use the root pid (it is running itself) and start inspecting the stats of the cgroup but this is failing out:

control, err := cgroup1.Load(cgroup1.PidPath(1))
if err != nil {
	logger.Error("error loading cgroup", "error", err)
}
.... 

Error:

2023-06-27T15:36:20.717Z [ERROR] error loading cgroup: error="cgroups: cgroup mountpoint does not exist"

When I inspect the /proc/1/cgroup I see this. Does that mean I can't access the cgroup which I am running in?

# cat /proc/1/cgroup
0::/

[chapmanc]

For reference it was because I was using cgroup v1 and the kernel was v2