diff --git a/metrics-server/vendor/k8s.io/apiserver/pkg/server/config_selfclient.go b/metrics-server/vendor/k8s.io/apiserver/pkg/server/config_selfclient.go
new file mode 100644
index 0000000..bf09161
--- /dev/null
+++ b/metrics-server/vendor/k8s.io/apiserver/pkg/server/config_selfclient.go
@@ -0,0 +1,83 @@
+/*
+Copyright 2016 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 server
+
+import (
+	"fmt"
+	"net"
+
+	restclient "k8s.io/client-go/rest"
+)
+
+// LoopbackClientServerNameOverride is passed to the apiserver from the loopback client in order to
+// select the loopback certificate via SNI if TLS is used.
+const LoopbackClientServerNameOverride = "apiserver-loopback-client"
+
+func (s *SecureServingInfo) NewLoopbackClientConfig(token string, loopbackCert []byte) (*restclient.Config, error) {
+	if s == nil || (s.Cert == nil && len(s.SNICerts) == 0) {
+		return nil, nil
+	}
+
+	host, port, err := LoopbackHostPort(s.Listener.Addr().String())
+	if err != nil {
+		return nil, err
+	}
+
+	return &restclient.Config{
+		// Increase QPS limits. The client is currently passed to all admission plugins,
+		// and those can be throttled in case of higher load on apiserver - see #22340 and #22422
+		// for more details. Once #22422 is fixed, we may want to remove it.
+		QPS:         50,
+		Burst:       100,
+		Host:        "https://" + net.JoinHostPort(host, port),
+		BearerToken: token,
+		// override the ServerName to select our loopback certificate via SNI. This name is also
+		// used by the client to compare the returns server certificate against.
+		TLSClientConfig: restclient.TLSClientConfig{
+			ServerName: LoopbackClientServerNameOverride,
+			CAData:     loopbackCert,
+		},
+	}, nil
+}
+
+// LoopbackHostPort returns the host and port loopback REST clients should use
+// to contact the server.
+func LoopbackHostPort(bindAddress string) (string, string, error) {
+	host, port, err := net.SplitHostPort(bindAddress)
+	if err != nil {
+		// should never happen
+		return "", "", fmt.Errorf("invalid server bind address: %q", bindAddress)
+	}
+
+	// Value is expected to be an IP or DNS name, not "0.0.0.0".
+	if host == "0.0.0.0" || host == "::" {
+		host = "localhost"
+		// Get ip of local interface, but fall back to "localhost".
+		// Note that "localhost" is resolved with the external nameserver first with Go's stdlib.
+		// So if localhost.<yoursearchdomain> resolves, we don't get a 127.0.0.1 as expected.
+		addrs, err := net.InterfaceAddrs()
+		if err == nil {
+			for _, address := range addrs {
+				if ipnet, ok := address.(*net.IPNet); ok && ipnet.IP.IsLoopback() {
+					host = ipnet.IP.String()
+					break
+				}
+			}
+		}
+	}
+	return host, port, nil
+}