diff --git a/metrics-server/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/validation/validation.go b/metrics-server/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/validation/validation.go
new file mode 100644
index 0000000..96e5f42
--- /dev/null
+++ b/metrics-server/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/validation/validation.go
@@ -0,0 +1,90 @@
+/*
+Copyright 2015 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 (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/validation"
+	"k8s.io/apimachinery/pkg/util/validation/field"
+)
+
+func ValidateLabelSelector(ps *metav1.LabelSelector, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	if ps == nil {
+		return allErrs
+	}
+	allErrs = append(allErrs, ValidateLabels(ps.MatchLabels, fldPath.Child("matchLabels"))...)
+	for i, expr := range ps.MatchExpressions {
+		allErrs = append(allErrs, ValidateLabelSelectorRequirement(expr, fldPath.Child("matchExpressions").Index(i))...)
+	}
+	return allErrs
+}
+
+func ValidateLabelSelectorRequirement(sr metav1.LabelSelectorRequirement, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	switch sr.Operator {
+	case metav1.LabelSelectorOpIn, metav1.LabelSelectorOpNotIn:
+		if len(sr.Values) == 0 {
+			allErrs = append(allErrs, field.Required(fldPath.Child("values"), "must be specified when `operator` is 'In' or 'NotIn'"))
+		}
+	case metav1.LabelSelectorOpExists, metav1.LabelSelectorOpDoesNotExist:
+		if len(sr.Values) > 0 {
+			allErrs = append(allErrs, field.Forbidden(fldPath.Child("values"), "may not be specified when `operator` is 'Exists' or 'DoesNotExist'"))
+		}
+	default:
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("operator"), sr.Operator, "not a valid selector operator"))
+	}
+	allErrs = append(allErrs, ValidateLabelName(sr.Key, fldPath.Child("key"))...)
+	return allErrs
+}
+
+// ValidateLabelName validates that the label name is correctly defined.
+func ValidateLabelName(labelName string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	for _, msg := range validation.IsQualifiedName(labelName) {
+		allErrs = append(allErrs, field.Invalid(fldPath, labelName, msg))
+	}
+	return allErrs
+}
+
+// ValidateLabels validates that a set of labels are correctly defined.
+func ValidateLabels(labels map[string]string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	for k, v := range labels {
+		allErrs = append(allErrs, ValidateLabelName(k, fldPath)...)
+		for _, msg := range validation.IsValidLabelValue(v) {
+			allErrs = append(allErrs, field.Invalid(fldPath, v, msg))
+		}
+	}
+	return allErrs
+}
+
+func ValidateDeleteOptions(options *metav1.DeleteOptions) field.ErrorList {
+	allErrs := field.ErrorList{}
+	if options.OrphanDependents != nil && options.PropagationPolicy != nil {
+		allErrs = append(allErrs, field.Invalid(field.NewPath("propagationPolicy"), options.PropagationPolicy, "orphanDependents and deletionPropagation cannot be both set"))
+	}
+	if options.PropagationPolicy != nil &&
+		*options.PropagationPolicy != metav1.DeletePropagationForeground &&
+		*options.PropagationPolicy != metav1.DeletePropagationBackground &&
+		*options.PropagationPolicy != metav1.DeletePropagationOrphan {
+		allErrs = append(allErrs, field.NotSupported(field.NewPath("propagationPolicy"), options.PropagationPolicy, []string{string(metav1.DeletePropagationForeground), string(metav1.DeletePropagationBackground), string(metav1.DeletePropagationOrphan), "nil"}))
+	}
+	return allErrs
+}
+
+const UninitializedStatusUpdateErrorMsg string = `must not update status when the object is uninitialized`