[Backport release-1.5] Fix: memory leak of the apiserver (#4777)

* Fix: memory leak of the apiserver

Signed-off-by: barnettZQG <barnett.zqg@gmail.com>
(cherry picked from commit 0a8a70730f)

* Fix: listen to the context done event

Signed-off-by: barnettZQG <barnett.zqg@gmail.com>
(cherry picked from commit dfb81224cb)

* Fix: remove the shutdown code

Signed-off-by: barnettZQG <barnett.zqg@gmail.com>
(cherry picked from commit a331b2c54a)

Co-authored-by: barnettZQG <barnett.zqg@gmail.com>

pkg/utils/pprof.go

@@ -0,0 +1,51 @@
+/*
+Copyright 2022 The KubeVela 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 utils
+
+import (
+	"net/http"
+	"net/http/pprof"
+
+	"k8s.io/klog/v2"
+)
+
+// EnablePprof listen to the pprofAddr and export the profiling results
+// If the errChan is nil, this function will panic when the listening error occurred.
+func EnablePprof(pprofAddr string, errChan chan error) {
+	// Start pprof server if enabled
+	mux := http.NewServeMux()
+	mux.HandleFunc("/debug/pprof/", 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)
+	pprofServer := http.Server{
+		Addr:    pprofAddr,
+		Handler: mux,
+	}
+
+	klog.InfoS("Starting debug HTTP server", "addr", pprofServer.Addr)
+
+	if err := pprofServer.ListenAndServe(); err != nil {
+		klog.Error(err, "Failed to start debug HTTP server")
+		if errChan != nil {
+			errChan <- err
+		} else {
+			panic(err)
+		}
+	}
+}