Add pprof to all VPA components

vertical-pod-autoscaler/pkg/admission-controller/main.go

@@ -42,6 +42,7 @@ import (
 	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/limitrange"
 	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics"
 	metrics_admission "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics/admission"
+	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/server"
 	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/status"
 	vpa_api_util "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/vpa"
 )
@@ -70,6 +71,7 @@ var (
 	kubeconfig                 = flag.String("kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
 	kubeApiQps                 = flag.Float64("kube-api-qps", 5.0, `QPS limit when making requests to Kubernetes apiserver`)
 	kubeApiBurst               = flag.Float64("kube-api-burst", 10.0, `QPS burst limit when making requests to Kubernetes apiserver`)
+	enableProfiling            = flag.Bool("profiling", false, "Is debug/pprof endpoint enabled")
 	namespace                  = os.Getenv("NAMESPACE")
 	serviceName                = flag.String("webhook-service", "vpa-webhook", "Kubernetes service under which webhook is registered. Used when registerByURL is set to false.")
 	webhookAddress             = flag.String("webhook-address", "", "Address under which webhook is registered. Used when registerByURL is set to true.")
@@ -92,8 +94,8 @@ func main() {
 	}
 
 	healthCheck := metrics.NewHealthCheck(time.Minute)
-	metrics.Initialize(*address, healthCheck)
 	metrics_admission.Register()
+	server.Initialize(enableProfiling, healthCheck, address)
 
 	config := common.CreateKubeConfigOrDie(*kubeconfig, float32(*kubeApiQps), int(*kubeApiBurst))
 

vertical-pod-autoscaler/pkg/recommender/main.go

@@ -51,6 +51,7 @@ import (
 	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics"
 	metrics_quality "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics/quality"
 	metrics_recommender "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics/recommender"
+	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/server"
 	vpa_api_util "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/vpa"
 )
 
@@ -64,6 +65,7 @@ var (
 	kubeconfig             = flag.String("kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
 	kubeApiQps             = flag.Float64("kube-api-qps", 5.0, `QPS limit when making requests to Kubernetes apiserver`)
 	kubeApiBurst           = flag.Float64("kube-api-burst", 10.0, `QPS burst limit when making requests to Kubernetes apiserver`)
+	enableProfiling        = flag.Bool("profiling", false, "Is debug/pprof endpoint enabled")
 
 	storage = flag.String("storage", "", `Specifies storage mode. Supported values: prometheus, checkpoint (default)`)
 	// prometheus history provider configs
@@ -128,9 +130,9 @@ func main() {
 	}
 
 	healthCheck := metrics.NewHealthCheck(*metricsFetcherInterval * 5)
-	metrics.Initialize(*address, healthCheck)
 	metrics_recommender.Register()
 	metrics_quality.Register()
+	server.Initialize(enableProfiling, healthCheck, address)
 
 	if !leaderElection.LeaderElect {
 		run(healthCheck)

vertical-pod-autoscaler/pkg/updater/main.go

@@ -45,6 +45,7 @@ import (
 	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/limitrange"
 	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics"
 	metrics_updater "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics/updater"
+	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/server"
 	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/status"
 	vpa_api_util "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/vpa"
 )
@@ -65,10 +66,11 @@ var (
 
 	evictionRateBurst = flag.Int("eviction-rate-burst", 1, `Burst of pods that can be evicted.`)
 
-	address      = flag.String("address", ":8943", "The address to expose Prometheus metrics.")
-	kubeconfig   = flag.String("kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
-	kubeApiQps   = flag.Float64("kube-api-qps", 5.0, `QPS limit when making requests to Kubernetes apiserver`)
-	kubeApiBurst = flag.Float64("kube-api-burst", 10.0, `QPS burst limit when making requests to Kubernetes apiserver`)
+	address         = flag.String("address", ":8943", "The address to expose Prometheus metrics.")
+	kubeconfig      = flag.String("kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
+	kubeApiQps      = flag.Float64("kube-api-qps", 5.0, `QPS limit when making requests to Kubernetes apiserver`)
+	kubeApiBurst    = flag.Float64("kube-api-burst", 10.0, `QPS burst limit when making requests to Kubernetes apiserver`)
+	enableProfiling = flag.Bool("profiling", false, "Is debug/pprof endpoint enabled")
 
 	useAdmissionControllerStatus = flag.Bool("use-admission-controller-status", true,
 		"If true, updater will only evict pods when admission controller status is valid.")
@@ -99,7 +101,8 @@ func main() {
 	}
 
 	healthCheck := metrics.NewHealthCheck(*updaterInterval * 5)
-	metrics.Initialize(*address, healthCheck)
+	server.Initialize(enableProfiling, healthCheck, address)
+
 	metrics_updater.Register()
 
 	if !leaderElection.LeaderElect {

vertical-pod-autoscaler/pkg/utils/metrics/metrics.go

@@ -19,14 +19,11 @@ package metrics
 
 import (
 	"math"
-	"net/http"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
 
 	_ "k8s.io/component-base/metrics/prometheus/restclient" // for client-go metrics registration
-	"k8s.io/klog/v2"
 )
 
 // ExecutionTimer measures execution time of a computation, split into major steps
@@ -46,18 +43,6 @@ const (
 	MaxVpaSizeLog = 20
 )
 
-// Initialize sets up Prometheus to expose metrics & (optionally) health-check on the given address
-func Initialize(address string, healthCheck *HealthCheck) {
-	go func() {
-		http.Handle("/metrics", promhttp.Handler())
-		if healthCheck != nil {
-			http.Handle("/health-check", healthCheck)
-		}
-		err := http.ListenAndServe(address, nil)
-		klog.Fatalf("Failed to start metrics: %v", err)
-	}()
-}
-
 // NewExecutionTimer provides a timer for admission latency; call ObserveXXX() on it to measure
 func NewExecutionTimer(histo *prometheus.HistogramVec) *ExecutionTimer {
 	now := time.Now()

vertical-pod-autoscaler/pkg/utils/server/server.go

@@ -0,0 +1,51 @@
+/*
+Copyright 2024 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 - common code for mux of all 3 VPA components
+package server
+
+import (
+	"net/http"
+	"net/http/pprof"
+
+	"k8s.io/klog/v2"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics"
+)
+
+// Initialize sets up Prometheus to expose metrics & (optionally) health-check and profiling on the given address
+func Initialize(enableProfiling *bool, healthCheck *metrics.HealthCheck, address *string) {
+	go func() {
+		mux := http.NewServeMux()
+
+		mux.Handle("/metrics", promhttp.Handler())
+		if healthCheck != nil {
+			mux.Handle("/health-check", healthCheck)
+		}
+
+		if *enableProfiling {
+			mux.HandleFunc("/debug/pprof/", http.HandlerFunc(pprof.Index))
+			mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
+			mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+			mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+			mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+		}
+
+		err := http.ListenAndServe(*address, mux)
+		klog.Fatalf("Failed to start metrics: %v", err)
+	}()
+}