func main()

in main.go [53:109]
48 lines of code
6 McCabe index (conditional complexity)

func main() {
	var metricsAddr string
	var enableLeaderElection bool
	flag.StringVar(&metricsAddr, "metrics-addr", "localhost:8080", "The address the metric endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	flag.StringVar(&watchNamespace, "namespace", "",
		"Namespace that the controller watches to reconcile etcdadmConfig objects. If unspecified, the controller watches forobjects across all namespaces.")

	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseDevMode(true)))

	opts := ctrl.Options{
		Scheme: scheme,
		Metrics: server.Options{
			BindAddress: metricsAddr,
		},
		LeaderElection:   enableLeaderElection,
		LeaderElectionID: "e949c6e2.cluster.x-k8s.io",
	}

	if watchNamespace != "" {
		opts.Cache = cache.Options{
			DefaultNamespaces: map[string]cache.Config{watchNamespace: {}},
		}
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), opts)
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}
	// Setup the context that's going to be used in controllers and for the manager.
	ctx := ctrl.SetupSignalHandler()
	if err = (&controllers.EtcdadmConfigReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("EtcdadmConfig"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(ctx, mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "EtcdadmConfig")
		os.Exit(1)
	}

	if err = (&bootstrapv1beta1.EtcdadmConfig{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "EtcdadmConfig")
		os.Exit(1)
	}
	// +kubebuilder:scaffold:builder

	setupLog.Info("starting manager")
	if err := mgr.Start(ctx); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}
}