diff --git a/metrics-server/vendor/k8s.io/apimachinery/pkg/api/validation/objectmeta.go b/metrics-server/vendor/k8s.io/apimachinery/pkg/api/validation/objectmeta.go
new file mode 100644
index 0000000..44b9b16
--- /dev/null
+++ b/metrics-server/vendor/k8s.io/apimachinery/pkg/api/validation/objectmeta.go
@@ -0,0 +1,308 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package validation
+
+import (
+	"fmt"
+	"strings"
+
+	apiequality "k8s.io/apimachinery/pkg/api/equality"
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	v1validation "k8s.io/apimachinery/pkg/apis/meta/v1/validation"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/apimachinery/pkg/util/validation"
+	"k8s.io/apimachinery/pkg/util/validation/field"
+)
+
+const FieldImmutableErrorMsg string = `field is immutable`
+
+const totalAnnotationSizeLimitB int = 256 * (1 << 10) // 256 kB
+
+// BannedOwners is a black list of object that are not allowed to be owners.
+var BannedOwners = map[schema.GroupVersionKind]struct{}{
+	{Group: "", Version: "v1", Kind: "Event"}: {},
+}
+
+// ValidateClusterName can be used to check whether the given cluster name is valid.
+var ValidateClusterName = NameIsDNS1035Label
+
+// ValidateAnnotations validates that a set of annotations are correctly defined.
+func ValidateAnnotations(annotations map[string]string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	var totalSize int64
+	for k, v := range annotations {
+		for _, msg := range validation.IsQualifiedName(strings.ToLower(k)) {
+			allErrs = append(allErrs, field.Invalid(fldPath, k, msg))
+		}
+		totalSize += (int64)(len(k)) + (int64)(len(v))
+	}
+	if totalSize > (int64)(totalAnnotationSizeLimitB) {
+		allErrs = append(allErrs, field.TooLong(fldPath, "", totalAnnotationSizeLimitB))
+	}
+	return allErrs
+}
+
+func validateOwnerReference(ownerReference metav1.OwnerReference, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	gvk := schema.FromAPIVersionAndKind(ownerReference.APIVersion, ownerReference.Kind)
+	// gvk.Group is empty for the legacy group.
+	if len(gvk.Version) == 0 {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("apiVersion"), ownerReference.APIVersion, "version must not be empty"))
+	}
+	if len(gvk.Kind) == 0 {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("kind"), ownerReference.Kind, "kind must not be empty"))
+	}
+	if len(ownerReference.Name) == 0 {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("name"), ownerReference.Name, "name must not be empty"))
+	}
+	if len(ownerReference.UID) == 0 {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("uid"), ownerReference.UID, "uid must not be empty"))
+	}
+	if _, ok := BannedOwners[gvk]; ok {
+		allErrs = append(allErrs, field.Invalid(fldPath, ownerReference, fmt.Sprintf("%s is disallowed from being an owner", gvk)))
+	}
+	return allErrs
+}
+
+func ValidateOwnerReferences(ownerReferences []metav1.OwnerReference, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	controllerName := ""
+	for _, ref := range ownerReferences {
+		allErrs = append(allErrs, validateOwnerReference(ref, fldPath)...)
+		if ref.Controller != nil && *ref.Controller {
+			if controllerName != "" {
+				allErrs = append(allErrs, field.Invalid(fldPath, ownerReferences,
+					fmt.Sprintf("Only one reference can have Controller set to true. Found \"true\" in references for %v and %v", controllerName, ref.Name)))
+			} else {
+				controllerName = ref.Name
+			}
+		}
+	}
+	return allErrs
+}
+
+// Validate finalizer names
+func ValidateFinalizerName(stringValue string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	for _, msg := range validation.IsQualifiedName(stringValue) {
+		allErrs = append(allErrs, field.Invalid(fldPath, stringValue, msg))
+	}
+
+	return allErrs
+}
+
+func ValidateNoNewFinalizers(newFinalizers []string, oldFinalizers []string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	extra := sets.NewString(newFinalizers...).Difference(sets.NewString(oldFinalizers...))
+	if len(extra) != 0 {
+		allErrs = append(allErrs, field.Forbidden(fldPath, fmt.Sprintf("no new finalizers can be added if the object is being deleted, found new finalizers %#v", extra.List())))
+	}
+	return allErrs
+}
+
+func ValidateImmutableField(newVal, oldVal interface{}, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	if !apiequality.Semantic.DeepEqual(oldVal, newVal) {
+		allErrs = append(allErrs, field.Invalid(fldPath, newVal, FieldImmutableErrorMsg))
+	}
+	return allErrs
+}
+
+// ValidateObjectMeta validates an object's metadata on creation. It expects that name generation has already
+// been performed.
+// It doesn't return an error for rootscoped resources with namespace, because namespace should already be cleared before.
+func ValidateObjectMeta(objMeta *metav1.ObjectMeta, requiresNamespace bool, nameFn ValidateNameFunc, fldPath *field.Path) field.ErrorList {
+	metadata, err := meta.Accessor(objMeta)
+	if err != nil {
+		allErrs := field.ErrorList{}
+		allErrs = append(allErrs, field.Invalid(fldPath, objMeta, err.Error()))
+		return allErrs
+	}
+	return ValidateObjectMetaAccessor(metadata, requiresNamespace, nameFn, fldPath)
+}
+
+// ValidateObjectMeta validates an object's metadata on creation. It expects that name generation has already
+// been performed.
+// It doesn't return an error for rootscoped resources with namespace, because namespace should already be cleared before.
+func ValidateObjectMetaAccessor(meta metav1.Object, requiresNamespace bool, nameFn ValidateNameFunc, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+
+	if len(meta.GetGenerateName()) != 0 {
+		for _, msg := range nameFn(meta.GetGenerateName(), true) {
+			allErrs = append(allErrs, field.Invalid(fldPath.Child("generateName"), meta.GetGenerateName(), msg))
+		}
+	}
+	// If the generated name validates, but the calculated value does not, it's a problem with generation, and we
+	// report it here. This may confuse users, but indicates a programming bug and still must be validated.
+	// If there are multiple fields out of which one is required then add an or as a separator
+	if len(meta.GetName()) == 0 {
+		allErrs = append(allErrs, field.Required(fldPath.Child("name"), "name or generateName is required"))
+	} else {
+		for _, msg := range nameFn(meta.GetName(), false) {
+			allErrs = append(allErrs, field.Invalid(fldPath.Child("name"), meta.GetName(), msg))
+		}
+	}
+	if requiresNamespace {
+		if len(meta.GetNamespace()) == 0 {
+			allErrs = append(allErrs, field.Required(fldPath.Child("namespace"), ""))
+		} else {
+			for _, msg := range ValidateNamespaceName(meta.GetNamespace(), false) {
+				allErrs = append(allErrs, field.Invalid(fldPath.Child("namespace"), meta.GetNamespace(), msg))
+			}
+		}
+	} else {
+		if len(meta.GetNamespace()) != 0 {
+			allErrs = append(allErrs, field.Forbidden(fldPath.Child("namespace"), "not allowed on this type"))
+		}
+	}
+	if len(meta.GetClusterName()) != 0 {
+		for _, msg := range ValidateClusterName(meta.GetClusterName(), false) {
+			allErrs = append(allErrs, field.Invalid(fldPath.Child("clusterName"), meta.GetClusterName(), msg))
+		}
+	}
+	allErrs = append(allErrs, ValidateNonnegativeField(meta.GetGeneration(), fldPath.Child("generation"))...)
+	allErrs = append(allErrs, v1validation.ValidateLabels(meta.GetLabels(), fldPath.Child("labels"))...)
+	allErrs = append(allErrs, ValidateAnnotations(meta.GetAnnotations(), fldPath.Child("annotations"))...)
+	allErrs = append(allErrs, ValidateOwnerReferences(meta.GetOwnerReferences(), fldPath.Child("ownerReferences"))...)
+	allErrs = append(allErrs, ValidateInitializers(meta.GetInitializers(), fldPath.Child("initializers"))...)
+	allErrs = append(allErrs, ValidateFinalizers(meta.GetFinalizers(), fldPath.Child("finalizers"))...)
+	return allErrs
+}
+
+func ValidateInitializers(initializers *metav1.Initializers, fldPath *field.Path) field.ErrorList {
+	var allErrs field.ErrorList
+	if initializers == nil {
+		return allErrs
+	}
+	for i, initializer := range initializers.Pending {
+		allErrs = append(allErrs, validation.IsFullyQualifiedName(fldPath.Child("pending").Index(i).Child("name"), initializer.Name)...)
+	}
+	allErrs = append(allErrs, validateInitializersResult(initializers.Result, fldPath.Child("result"))...)
+	return allErrs
+}
+
+func validateInitializersResult(result *metav1.Status, fldPath *field.Path) field.ErrorList {
+	var allErrs field.ErrorList
+	if result == nil {
+		return allErrs
+	}
+	switch result.Status {
+	case metav1.StatusFailure:
+	default:
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("status"), result.Status, "must be 'Failure'"))
+	}
+	return allErrs
+}
+
+// ValidateFinalizers tests if the finalizers name are valid, and if there are conflicting finalizers.
+func ValidateFinalizers(finalizers []string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	hasFinalizerOrphanDependents := false
+	hasFinalizerDeleteDependents := false
+	for _, finalizer := range finalizers {
+		allErrs = append(allErrs, ValidateFinalizerName(finalizer, fldPath)...)
+		if finalizer == metav1.FinalizerOrphanDependents {
+			hasFinalizerOrphanDependents = true
+		}
+		if finalizer == metav1.FinalizerDeleteDependents {
+			hasFinalizerDeleteDependents = true
+		}
+	}
+	if hasFinalizerDeleteDependents && hasFinalizerOrphanDependents {
+		allErrs = append(allErrs, field.Invalid(fldPath, finalizers, fmt.Sprintf("finalizer %s and %s cannot be both set", metav1.FinalizerOrphanDependents, metav1.FinalizerDeleteDependents)))
+	}
+	return allErrs
+}
+
+// ValidateObjectMetaUpdate validates an object's metadata when updated
+func ValidateObjectMetaUpdate(newMeta, oldMeta *metav1.ObjectMeta, fldPath *field.Path) field.ErrorList {
+	newMetadata, err := meta.Accessor(newMeta)
+	if err != nil {
+		allErrs := field.ErrorList{}
+		allErrs = append(allErrs, field.Invalid(fldPath, newMeta, err.Error()))
+		return allErrs
+	}
+	oldMetadata, err := meta.Accessor(oldMeta)
+	if err != nil {
+		allErrs := field.ErrorList{}
+		allErrs = append(allErrs, field.Invalid(fldPath, oldMeta, err.Error()))
+		return allErrs
+	}
+	return ValidateObjectMetaAccessorUpdate(newMetadata, oldMetadata, fldPath)
+}
+
+func ValidateObjectMetaAccessorUpdate(newMeta, oldMeta metav1.Object, fldPath *field.Path) field.ErrorList {
+	var allErrs field.ErrorList
+
+	// Finalizers cannot be added if the object is already being deleted.
+	if oldMeta.GetDeletionTimestamp() != nil {
+		allErrs = append(allErrs, ValidateNoNewFinalizers(newMeta.GetFinalizers(), oldMeta.GetFinalizers(), fldPath.Child("finalizers"))...)
+	}
+
+	// Reject updates that don't specify a resource version
+	if len(newMeta.GetResourceVersion()) == 0 {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("resourceVersion"), newMeta.GetResourceVersion(), "must be specified for an update"))
+	}
+
+	// Generation shouldn't be decremented
+	if newMeta.GetGeneration() < oldMeta.GetGeneration() {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("generation"), newMeta.GetGeneration(), "must not be decremented"))
+	}
+
+	allErrs = append(allErrs, ValidateInitializersUpdate(newMeta.GetInitializers(), oldMeta.GetInitializers(), fldPath.Child("initializers"))...)
+
+	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetName(), oldMeta.GetName(), fldPath.Child("name"))...)
+	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetNamespace(), oldMeta.GetNamespace(), fldPath.Child("namespace"))...)
+	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetUID(), oldMeta.GetUID(), fldPath.Child("uid"))...)
+	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetCreationTimestamp(), oldMeta.GetCreationTimestamp(), fldPath.Child("creationTimestamp"))...)
+	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetDeletionTimestamp(), oldMeta.GetDeletionTimestamp(), fldPath.Child("deletionTimestamp"))...)
+	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetDeletionGracePeriodSeconds(), oldMeta.GetDeletionGracePeriodSeconds(), fldPath.Child("deletionGracePeriodSeconds"))...)
+	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetClusterName(), oldMeta.GetClusterName(), fldPath.Child("clusterName"))...)
+
+	allErrs = append(allErrs, v1validation.ValidateLabels(newMeta.GetLabels(), fldPath.Child("labels"))...)
+	allErrs = append(allErrs, ValidateAnnotations(newMeta.GetAnnotations(), fldPath.Child("annotations"))...)
+	allErrs = append(allErrs, ValidateOwnerReferences(newMeta.GetOwnerReferences(), fldPath.Child("ownerReferences"))...)
+
+	return allErrs
+}
+
+// ValidateInitializersUpdate checks the update of the metadata initializers field
+func ValidateInitializersUpdate(newInit, oldInit *metav1.Initializers, fldPath *field.Path) field.ErrorList {
+	var allErrs field.ErrorList
+	switch {
+	case oldInit == nil && newInit != nil:
+		// Initializers may not be set on new objects
+		allErrs = append(allErrs, field.Invalid(fldPath, nil, "field is immutable once initialization has completed"))
+	case oldInit != nil && newInit == nil:
+		// this is a valid transition and means initialization was successful
+	case oldInit != nil && newInit != nil:
+		// validate changes to initializers
+		switch {
+		case oldInit.Result == nil && newInit.Result != nil:
+			// setting a result is allowed
+			allErrs = append(allErrs, validateInitializersResult(newInit.Result, fldPath.Child("result"))...)
+		case oldInit.Result != nil:
+			// setting Result implies permanent failure, and all future updates will be prevented
+			allErrs = append(allErrs, ValidateImmutableField(newInit.Result, oldInit.Result, fldPath.Child("result"))...)
+		default:
+			// leaving the result nil is allowed
+		}
+	}
+	return allErrs
+}