Update --metrics-bind-address usage description

Signed-off-by: RainbowMango <[email protected]>

cmd/controller-manager/app/options/options.go

@@ -131,5 +131,5 @@ func (o *Options) AddFlags(flags *pflag.FlagSet, allControllers []string) {
 	flags.IntVar(&o.KubeAPIBurst, "kube-api-burst", 60, "Burst to use while talking with karmada-apiserver. Doesn't cover events and node heartbeat apis which rate limiting is controlled by a different set of flags.")
 	flags.DurationVar(&o.ClusterCacheSyncTimeout.Duration, "cluster-cache-sync-timeout", util.CacheSyncTimeout, "Timeout period waiting for cluster cache to sync.")
 	flags.DurationVar(&o.ResyncPeriod.Duration, "resync-period", 0, "Base frequency the informers are resynced.")
-	flags.StringVar(&o.MetricsBindAddress, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
+	flags.StringVar(&o.MetricsBindAddress, "metrics-bind-address", ":8080", "The TCP address that the controller should bind to for serving prometheus metrics(e.g. 127.0.0.1:8088, :8088)")
 }