cgroup collector/analyzer

[banjoh]

Describe the rationale for the suggested feature.

Kubernetes components need cgroup and its controllers to be enabled and configured respectively to work. This collector/analyser will inspect an OS to extract configuration and probe the kernel (and any other part of the OS) to gather as much cgroup information in the system

Describe the feature

• Collector - Gathers cgroup configuration information from an OS. The collector will collect
  • Version - v1 or v2
  • Controllers - cpu, memory...

- collectors:
      cgroup: {}

• Analyser: json analyser, but depending on findings we might need a cgroup analyser. Specifically, if we need to check multiple fields to make a decision based on a logical OR, then a new analyser might be the way forward.

Additional information

k0s collects cgroup information from linux in this probe code