code: func getSupportedSubsystems() map[subsystem]bool {
  	supportedSubsystems := map[subsystem]bool{
  		&cgroupfs.MemoryGroup{}: true,
  		&cgroupfs.CpuGroup{}:    true,
  		&cgroupfs.PidsGroup{}:   true,
  	}
  	// not all hosts support hugetlb cgroup, and in the absent of hugetlb, we will fail silently by reporting no capacity.
  	supportedSubsystems[&cgroupfs.HugetlbGroup{}] = false
  	if utilfeature.DefaultFeatureGate.Enabled(kubefeatures.SupportPodPidsLimit) || utilfeature.DefaultFeatureGate.Enabled(kubefeatures.SupportNodePidsLimit) {
  		supportedSubsystems[&cgroupfs.PidsGroup{}] = true
  	}
  	return supportedSubsystems
  }
docs: // getSupportedSubsystems returns a map of subsystem and if it must be mounted for the kubelet to function.