DRA device taints: copy taintseviction controller

This is a verbatim copy of the current pkg/controller/taintseviction code,
revision fc268ec (v1.33.0 plus one commit),
minus the TimedWorker helper.

The intent is to modify the code such that it enforces eviction of pods which
use tainted devices.

Author: pohly

pkg/controller/devicetainteviction/OWNERS

@@ -0,0 +1,8 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+approvers:
+  - sig-scheduling-maintainers
+reviewers:
+  - sig-scheduling
+labels:
+  - sig/scheduling

pkg/controller/devicetainteviction/doc.go

@@ -0,0 +1,19 @@
+/*
+Copyright 2023 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 tainteviction contains the logic implementing taint-based eviction
+// for Pods running on Nodes with NoExecute taints.
+package tainteviction

pkg/controller/devicetainteviction/metrics/metrics.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2023 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 metrics
+
+import (
+	"sync"
+
+	"k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+)
+
+const taintEvictionControllerSubsystem = "taint_eviction_controller"
+
+var (
+	// PodDeletionsTotal counts the number of Pods deleted by TaintEvictionController since its start.
+	PodDeletionsTotal = metrics.NewCounter(
+		&metrics.CounterOpts{
+			Subsystem:      taintEvictionControllerSubsystem,
+			Name:           "pod_deletions_total",
+			Help:           "Total number of Pods deleted by TaintEvictionController since its start.",
+			StabilityLevel: metrics.ALPHA,
+		},
+	)
+
+	// PodDeletionsLatency tracks the latency, in seconds, between the time when a taint effect has been activated
+	// for the Pod and its deletion.
+	PodDeletionsLatency = metrics.NewHistogram(
+		&metrics.HistogramOpts{
+			Subsystem:      taintEvictionControllerSubsystem,
+			Name:           "pod_deletion_duration_seconds",
+			Help:           "Latency, in seconds, between the time when a taint effect has been activated for the Pod and its deletion via TaintEvictionController.",
+			Buckets:        []float64{0.005, 0.025, 0.1, 0.5, 1, 2.5, 10, 30, 60, 120, 180, 240}, // 5ms to 4m
+			StabilityLevel: metrics.ALPHA,
+		},
+	)
+)
+
+var registerMetrics sync.Once
+
+// Register registers TaintEvictionController metrics.
+func Register() {
+	registerMetrics.Do(func() {
+		legacyregistry.MustRegister(PodDeletionsTotal)
+		legacyregistry.MustRegister(PodDeletionsLatency)
+	})
+}