Use the Admiral metrics/profile helper and enable profiling

The CoreDNS plugin uses the built-in profiling support.

Signed-off-by: Stephen Kitt <skitt@redhat.com>

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/onsi/gomega v1.31.1
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.18.0
-	github.com/submariner-io/admiral v0.18.0-m0
+	github.com/submariner-io/admiral v0.18.0-m0.0.20240202125330-437b20afae61
 	github.com/submariner-io/shipyard v0.18.0-m0
 	k8s.io/api v0.29.1
 	k8s.io/apimachinery v0.29.1

go.sum

@@ -390,8 +390,8 @@ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-github.com/submariner-io/admiral v0.18.0-m0 h1:kGXUY4a/j1STdC3I173WnjurlWd6ADmhC16qRB+cNV0=
-github.com/submariner-io/admiral v0.18.0-m0/go.mod h1:6WKEdEhKHUGbAz2EwMSALZpyT0iWKQX6noJyEezyDTI=
+github.com/submariner-io/admiral v0.18.0-m0.0.20240202125330-437b20afae61 h1:XVWSRQ959C0PRe6LkCMjvyWCOWh2Ns8WaIuMe8xLMz8=
+github.com/submariner-io/admiral v0.18.0-m0.0.20240202125330-437b20afae61/go.mod h1:6WKEdEhKHUGbAz2EwMSALZpyT0iWKQX6noJyEezyDTI=
 github.com/submariner-io/shipyard v0.18.0-m0 h1:d5iJP6LWyLprbMYdzVDh4mZn/Qsgt7X15Gamv1d5q+Y=
 github.com/submariner-io/shipyard v0.18.0-m0/go.mod h1:1TX7V+rxEEEZKm5t7kruTyBm52eOk7PSBJLAqMrqNNc=
 github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=

pkg/agent/main.go

@@ -19,15 +19,12 @@ limitations under the License.
 package main
 
 import (
-	"errors"
 	"flag"
 	"fmt"
-	"net/http"
 	"os"
-	"time"
 
 	"github.com/kelseyhightower/envconfig"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/submariner-io/admiral/pkg/http"
 	"github.com/submariner-io/admiral/pkg/log"
 	"github.com/submariner-io/admiral/pkg/log/kzerolog"
 	"github.com/submariner-io/admiral/pkg/names"
@@ -147,33 +144,15 @@ func main() {
 	err = lightHouseAgent.Start(ctx.Done())
 	exitOnError(err, "Failed to start lighthouse agent")
 
-	httpServer := startHTTPServer()
+	defer http.StartServer(http.Metrics|http.Profile, 8082)()
 
 	<-ctx.Done()
 
 	logger.Info("All controllers stopped or exited. Stopping main loop")
-
-	if err := httpServer.Shutdown(ctx); err != nil {
-		logger.Error(err, "Error shutting down metrics HTTP server")
-	}
 }
 
 func init() {
 	flag.StringVar(&kubeConfig, "kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
 	flag.StringVar(&masterURL, "master", "",
 		"The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
 }
-
-func startHTTPServer() *http.Server {
-	srv := &http.Server{Addr: ":8082", ReadHeaderTimeout: 60 * time.Second}
-
-	http.Handle("/metrics", promhttp.Handler())
-
-	go func() {
-		if err := srv.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
-			logger.Error(err, "Error starting metrics server")
-		}
-	}()
-
-	return srv
-}