This commit adds 2 new metadata labels for the endpointslice role: * `__meta_kubernetes_endpointslice_endpoint_node_name` * `__meta_kubernetes_endpointslice_endpoint_zone` The latter is only present when the `discovery.k8s.io/v1` API group is available. I also updated the configuration doc and added an entry for the `__meta_kubernetes_endpointslice_endpoint_hostname` label which was missing. Signed-off-by: Simon Pasquier <spasquie@redhat.com>