code: func NewCgroupNotifier(path, attribute string, threshold int64) (CgroupNotifier, error) {
  	klog.V(5).Infof("cgroup notifications not supported")
  	return &unsupportedThresholdNotifier{}, nil
  }
docs: // NewCgroupNotifier creates a cgroup notifier that does nothing because cgroups do not exist on non-linux systems.