controllersWithoutFeatureGates := KnownControllers()

	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, "AllAlpha", true)
	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, "AllBeta", true)

	controllersWithFeatureGates := KnownControllers()

//
// USE CASES
// The following places should use the controller name constants, when:
//  1. defining a new app.ControllerDescriptor so it can be used in app.NewControllerDescriptors or app.KnownControllers:
//  2. used anywhere inside the controller itself:
//     2.1. [TODO] logging should use a canonical controller name when referencing a controller (Eg. Starting X, Shutting down X)

	}

	fs := pflag.NewFlagSet("test", pflag.PanicOnError)

	s, err := options.NewKubeControllerManagerOptions()
	if err != nil {
		return TestServer{}, err
	}
	all, disabled, aliases := app.KnownControllers(), app.ControllersDisabledByDefault(), app.ControllerAliases()
	namedFlagSets := s.Flags(all, disabled, aliases)
	for _, f := range namedFlagSets.FlagSets {
		fs.AddFlagSet(f)
	}
	fs.Parse(customFlags)

func (r *ControllerDescriptor) RequiresSpecialHandling() bool {
	return r.requiresSpecialHandling
}

// KnownControllers returns all known controllers's name
func KnownControllers() []string {
	return sets.StringKeySet(NewControllerDescriptors()).List()
}

// ControllerAliases returns a mapping of aliases to canonical controller names