func main()

in main.go [110:194]
72 lines of code
12 McCabe index (conditional complexity)

func main() {
	opts := setFlags()  // Add our options to flag set.
	klog.InitFlags(nil) // Add klog options to flag set.
	flag.Parse()

	ctrl.SetLogger(klogr.New())

	// Setup CloudStack api client.
	client, err := cloud.NewClient(opts.CloudConfigFile)
	if err != nil {
		if !strings.Contains(err.Error(), "Timeout") {
			setupLog.Error(err, "unable to start manager")
			os.Exit(1)
		}
		setupLog.Info("cannot connect to CloudStack via client at startup time.  Pressing onward...")
	}
	setupLog.Info("CloudStack client initialized.")

	// Create the controller manager.
	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 scheme,
		MetricsBindAddress:     opts.MetricsAddr,
		Port:                   9443,
		HealthProbeBindAddress: opts.ProbeAddr,
		LeaderElection:         opts.EnableLeaderElection,
		LeaderElectionID:       "capc-leader-election-controller",
		Namespace:              opts.WatchingNamespace,
		CertDir:                opts.CertDir,
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	// Register machine and cluster reconcilers with the controller manager.
	if err = (&controllers.CloudStackClusterReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("Cluster"),
		Scheme: mgr.GetScheme(),
		CS:     client,
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "CloudStackCluster")
		os.Exit(1)
	}
	if err = (&controllers.CloudStackMachineReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("Machine"),
		Scheme: mgr.GetScheme(),
		CS:     client,
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "CloudStackMachine")
		os.Exit(1)
	}
	//+kubebuilder:scaffold:builder

	// Add health and ready checks.
	if err = mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up health check")
		os.Exit(1)
	}
	if err = mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up ready check")
		os.Exit(1)
	}

	// Start the controller manager.
	if err = (&infrav1.CloudStackCluster{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "CloudStackCluster")
		os.Exit(1)
	}
	if err = (&infrav1.CloudStackMachine{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "CloudStackMachine")
		os.Exit(1)
	}
	if err = (&infrav1.CloudStackMachineTemplate{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "CloudStackMachineTemplate")
		os.Exit(1)
	}

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