remove kubernetes.io/hostname label copying

Author: munnerz

pkg/features/kube_features.go

@@ -970,8 +970,8 @@ const (
 	// alpha: v1.33
 	//
 	// Enables the PodTopologyLabelsAdmission admission plugin that mutates `pod/binding`
-	// requests by copying the `topology.k8s.io/{zone,region}` and `kubernetes.io/hostname`
-	// labels from the assigned Node object (in the Binding being admitted) onto the Binding
+	// requests by copying the `topology.k8s.io/{zone,region}` labels from the assigned
+	// Node object (in the Binding being admitted) onto the Binding
 	// so that it can be persisted onto the Pod object when the Pod is being scheduled.
 	// This allows workloads running in pods to understand the topology information of their assigned node.
 	// Enabling this feature also permits external schedulers to set labels on pods in an atomic

plugin/pkg/admission/podtopologylabels/admission.go

@@ -41,7 +41,7 @@ const PluginName = "PodTopologyLabels"
 // This configuration is used by kube-apiserver.
 // It is not exported to avoid any chance of accidentally mutating the variable.
 var defaultConfig = Config{
-	Labels: []string{"topology.k8s.io/zone", "topology.k8s.io/region", "kubernetes.io/hostname"},
+	Labels: []string{"topology.k8s.io/zone", "topology.k8s.io/region"},
 }
 
 // Register registers a plugin