list the default enabled admission plugins

staging/src/k8s.io/apiserver/pkg/server/options/admission.go

@@ -93,11 +93,13 @@ func (a *AdmissionOptions) AddFlags(fs *pflag.FlagSet) {
 	}
 
 	fs.StringSliceVar(&a.EnablePlugins, "enable-admission-plugins", a.EnablePlugins, ""+
-		"admission plugins that should be enabled in addition to default enabled ones. "+
+		"admission plugins that should be enabled in addition to default enabled ones ("+
+		strings.Join(a.defaultEnabledPluginNames(), ", ")+"). "+
 		"Comma-delimited list of admission plugins: "+strings.Join(a.Plugins.Registered(), ", ")+". "+
 		"The order of plugins in this flag does not matter.")
 	fs.StringSliceVar(&a.DisablePlugins, "disable-admission-plugins", a.DisablePlugins, ""+
-		"admission plugins that should be disabled although they are in the default enabled plugins list. "+
+		"admission plugins that should be disabled although they are in the default enabled plugins list ("+
+		strings.Join(a.defaultEnabledPluginNames(), ", ")+"). "+
 		"Comma-delimited list of admission plugins: "+strings.Join(a.Plugins.Registered(), ", ")+". "+
 		"The order of plugins in this flag does not matter.")
 	fs.StringVar(&a.ConfigFile, "admission-control-config-file", a.ConfigFile,
@@ -218,3 +220,15 @@ func (a *AdmissionOptions) enabledPluginNames() []string {
 
 	return orderedPlugins
 }
+
+//Return names of plugins which are enabled by default
+func (a *AdmissionOptions) defaultEnabledPluginNames() []string {
+	defaultOnPluginNames := []string{}
+	for _, pluginName := range a.RecommendedPluginOrder {
+		if !a.DefaultOffPlugins.Has(pluginName) {
+			defaultOnPluginNames = append(defaultOnPluginNames, pluginName)
+		}
+	}
+
+	return defaultOnPluginNames
+}