cluster: move metrics to 8081 port

8080 by default used by metrics server is used
as a liveness/readiness probe address in sidecar
controller. Metrics aren't used anywhere yet, so it's
better to move it instead probes.

pkg/cmd/operator.go

@@ -36,7 +36,8 @@ func newOperatorCmd(ctx context.Context, logger log.Logger, level zap.AtomicLeve
 			cfg := ctrl.GetConfigOrDie()
 			// Create a new Cmd to provide shared dependencies and start components
 			mgr, err := ctrl.NewManager(cfg, ctrl.Options{
-				Scheme: scheme,
+				Scheme:             scheme,
+				MetricsBindAddress: fmt.Sprintf(":%d", naming.MetricsPort),
 			})
 			if err != nil {
 				logger.Fatal(ctx, "unable to create manager", "error", err)

pkg/naming/constants.go

@@ -83,4 +83,5 @@ const (
 	ReadinessProbePath = "/readyz"
 	LivenessProbePath  = "/healthz"
 	ProbePort          = 8080
+	MetricsPort        = 8081
 )