Update custom-metrics-apiserver and metrics-server

vendor/k8s.io/apiserver/pkg/util/flowcontrol/counter/interface.go

@@ -0,0 +1,33 @@
+/*
+Copyright 2019 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 counter
+
+// GoRoutineCounter keeps track of the number of active goroutines
+// working on/for something.  This is a utility that makes such code more
+// testable.  The code uses this utility to report the number of active
+// goroutines to the test code, so that the test code can advance a fake
+// clock when and only when the code being tested has finished all
+// the work that is ready to do at the present time.
+type GoRoutineCounter interface {
+	// Add adds the given delta to the count of active goroutines.
+	// Call Add(1) before forking a goroutine, Add(-1) at the end of that goroutine.
+	// Call Add(-1) just before waiting on something from another goroutine (e.g.,
+	// just before a `select`).
+	// Call Add(1) just before doing something that unblocks a goroutine that is
+	// waiting on that something.
+	Add(delta int)
+}

vendor/k8s.io/apiserver/pkg/util/flowcontrol/counter/noop.go

@@ -0,0 +1,25 @@
+/*
+Copyright 2019 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 counter
+
+// NoOp is a GoRoutineCounter that does not actually count
+type NoOp struct{}
+
+var _ GoRoutineCounter = NoOp{}
+
+// Add would adjust the count, if a count were being kept
+func (NoOp) Add(int) {}