If kubelet is run with systemd (as it always is when using kubespray),
it starts in systemd's /system.slice/kubelet.service cgroup.
This commit prevents a creation and usage of a second unrelated cgroup.
targetRef on endpoints surfaces as
__meta_kubernetes_endpoint_address_target_kind/__meta_kubernetes_endpoint_address_target_name
in prometheus and gets converted to the label `node` by
prometheus-operator
to remove deprecation warning:
> Flag --feature-gates has been deprecated, This parameter should be set via the config file specified by the Kubelet's --config flag.
Ilya Margolin