Add show hidden flag to kube-proxy

pkg/proxy/apis/config/types.go

@@ -153,6 +153,8 @@ type KubeProxyConfiguration struct {
 	NodePortAddresses []string
 	// winkernel contains winkernel-related configuration options.
 	Winkernel KubeProxyWinkernelConfiguration
+	// ShowHiddenMetricsForVersion is the version for which you want to show hidden metrics.
+	ShowHiddenMetricsForVersion string
 }
 
 // Currently, three modes of proxy are available in Linux platform: 'userspace' (older, going to be EOL), 'iptables'

pkg/proxy/apis/config/validation/validation.go

@@ -27,6 +27,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	componentbaseconfig "k8s.io/component-base/config"
+	"k8s.io/component-base/metrics"
 	apivalidation "k8s.io/kubernetes/pkg/apis/core/validation"
 	kubefeatures "k8s.io/kubernetes/pkg/features"
 	kubeproxyconfig "k8s.io/kubernetes/pkg/proxy/apis/config"
@@ -87,6 +88,7 @@ func Validate(config *kubeproxyconfig.KubeProxyConfiguration) field.ErrorList {
 	}
 
 	allErrs = append(allErrs, validateKubeProxyNodePortAddress(config.NodePortAddresses, newPath.Child("NodePortAddresses"))...)
+	allErrs = append(allErrs, validateShowHiddenMetricsVersion(config.ShowHiddenMetricsForVersion, newPath.Child("ShowHiddenMetricsForVersion"))...)
 
 	return allErrs
 }
@@ -274,3 +276,13 @@ func validateIPVSExcludeCIDRs(excludeCIDRs []string, fldPath *field.Path) field.
 	}
 	return allErrs
 }
+
+func validateShowHiddenMetricsVersion(version string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	errs := metrics.ValidateShowHiddenMetricsVersion(version)
+	for _, e := range errs {
+		allErrs = append(allErrs, field.Invalid(fldPath, version, e.Error()))
+	}
+
+	return allErrs
+}