diff --git a/metrics-server/vendor/k8s.io/apimachinery/pkg/runtime/types_proto.go b/metrics-server/vendor/k8s.io/apimachinery/pkg/runtime/types_proto.go
new file mode 100644
index 0000000..ead96ee
--- /dev/null
+++ b/metrics-server/vendor/k8s.io/apimachinery/pkg/runtime/types_proto.go
@@ -0,0 +1,69 @@
+/*
+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 runtime
+
+import (
+	"fmt"
+)
+
+type ProtobufMarshaller interface {
+	MarshalTo(data []byte) (int, error)
+}
+
+// NestedMarshalTo allows a caller to avoid extra allocations during serialization of an Unknown
+// that will contain an object that implements ProtobufMarshaller.
+func (m *Unknown) NestedMarshalTo(data []byte, b ProtobufMarshaller, size uint64) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	data[i] = 0xa
+	i++
+	i = encodeVarintGenerated(data, i, uint64(m.TypeMeta.Size()))
+	n1, err := m.TypeMeta.MarshalTo(data[i:])
+	if err != nil {
+		return 0, err
+	}
+	i += n1
+
+	if b != nil {
+		data[i] = 0x12
+		i++
+		i = encodeVarintGenerated(data, i, size)
+		n2, err := b.MarshalTo(data[i:])
+		if err != nil {
+			return 0, err
+		}
+		if uint64(n2) != size {
+			// programmer error: the Size() method for protobuf does not match the results of MarshalTo, which means the proto
+			// struct returned would be wrong.
+			return 0, fmt.Errorf("the Size() value of %T was %d, but NestedMarshalTo wrote %d bytes to data", b, size, n2)
+		}
+		i += n2
+	}
+
+	data[i] = 0x1a
+	i++
+	i = encodeVarintGenerated(data, i, uint64(len(m.ContentEncoding)))
+	i += copy(data[i:], m.ContentEncoding)
+
+	data[i] = 0x22
+	i++
+	i = encodeVarintGenerated(data, i, uint64(len(m.ContentType)))
+	i += copy(data[i:], m.ContentType)
+	return i, nil
+}