diff --git a/metrics-server/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/duration.go b/metrics-server/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/duration.go
new file mode 100644
index 0000000..2eaabf0
--- /dev/null
+++ b/metrics-server/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/duration.go
@@ -0,0 +1,50 @@
+/*
+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 v1
+
+import (
+	"encoding/json"
+	"time"
+)
+
+// Duration is a wrapper around time.Duration which supports correct
+// marshaling to YAML and JSON. In particular, it marshals into strings, which
+// can be used as map keys in json.
+type Duration struct {
+	time.Duration `protobuf:"varint,1,opt,name=duration,casttype=time.Duration"`
+}
+
+// UnmarshalJSON implements the json.Unmarshaller interface.
+func (d *Duration) UnmarshalJSON(b []byte) error {
+	var str string
+	err := json.Unmarshal(b, &str)
+	if err != nil {
+		return err
+	}
+
+	pd, err := time.ParseDuration(str)
+	if err != nil {
+		return err
+	}
+	d.Duration = pd
+	return nil
+}
+
+// MarshalJSON implements the json.Marshaler interface.
+func (d Duration) MarshalJSON() ([]byte, error) {
+	return json.Marshal(d.Duration.String())
+}