switch {
	case errors.IsNotFound(err):
		// ignore, authConfigMap is nil now
		return nil
	case errors.IsForbidden(err):
		klog.Warningf("Unable to get configmap/%s in %s.  Usually fixed by "+
			"'kubectl create rolebinding -n %s ROLEBINDING_NAME --role=%s --serviceaccount=YOUR_NS:YOUR_SA'",

	}
	// If the current API Server location on disk doesn't match the expected API server, show a warning
	if currentConfig.Clusters[currentCluster].Server != config.Clusters[expectedCluster].Server {
		klog.Warningf("a kubeconfig file %q exists already but has an unexpected API Server URL: expected: %s, got: %s",

		klog.V(1).Infof("[reset] Loaded client set from kubeconfig file: %s", opts.kubeconfigPath)
		initCfg, err = configutil.FetchInitConfigurationFromCluster(client, nil, "reset", false, false)
		if err != nil {
			klog.Warningf("[reset] Unable to fetch the kubeadm-config ConfigMap from cluster: %v", err)
		}
	} else {
		klog.V(1).Infof("[reset] Could not obtain a client set from the kubeconfig file: %s", opts.kubeconfigPath)
	}

	if len(args) == 0 {
		opt.externalcfg.Discovery.BootstrapToken = nil
	} else {
		if len(opt.cfgPath) == 0 && len(args) > 1 {
			klog.Warningf("[preflight] WARNING: More than one API server endpoint supplied on command line %v. Using the first one.", args)
		}
		opt.externalcfg.Discovery.BootstrapToken.APIServerEndpoint = args[0]
	}

			}
			// If the mount path could not be found, don't fail the unmount, but instead log a warning and proceed,
			// using the value from deviceToDetach.DeviceMountPath, so that the device can be marked as unmounted
			deviceMountPath = deviceToDetach.DeviceMountPath
			klog.Warningf(deviceToDetach.GenerateMsgDetailed(fmt.Sprintf(

		e.Subsets = endpointsv1.RepackSubsets(e.Subsets)
	}

	if len(e.Subsets) != 0 && !portsCorrect {
		// Reset ports.
		e.Subsets[0].Ports = endpointPorts
	}

	klog.Warningf("Resetting endpoints for master service %q to %v", serviceName, masterIPs)
	if shouldCreate {
		if _, err = r.epAdapter.Create(corev1.NamespaceDefault, e); errors.IsAlreadyExists(err) {
			err = nil
		}
	} else {

	fcIfc utilflowcontrol.Interface,
	workEstimator flowcontrolrequest.WorkEstimatorFunc,
	defaultRequestWaitLimit time.Duration,
) http.Handler {
	if fcIfc == nil {
		klog.Warningf("priority and fairness support not found, skipping")
		return handler
	}
	initAPFOnce.Do(func() {
		initMaxInFlight(0, 0)
		// Fetching these gauges is delayed until after their underlying metric has been registered

	allErrs = append(allErrs, componentconfigs.Validate(c)...)
	for _, certError := range ValidateCertValidity(c) {
		klog.Warningf("WARNING: %s", certError.Error())
	}
	return allErrs
}

// ValidateAPIServer validates a APIServer object and collects all encountered errors
func ValidateAPIServer(a *kubeadm.APIServer, fldPath *field.Path) field.ErrorList {

	if addr == nil {
		warnings = append(warnings, errors.Errorf("hostname \"%s\" could not be reached", hc.nodeName))
	}
	if err != nil {
		warnings = append(warnings, errors.Wrapf(err, "hostname \"%s\"", hc.nodeName))
	}
	return warnings, errorList
}

// HTTPProxyCheck checks if https connection to specific host is going
// to be done directly or over proxy. If proxy detected, it will return warning.
type HTTPProxyCheck struct {

			// Errors in Corefile Migration is verified during preflight checks. This part will be executed when a user has chosen
			// to ignore preflight check errors.
			canMigrateCorefile = false
			klog.Warningf("the CoreDNS Configuration was not migrated: %v. The existing CoreDNS Corefile configuration has been retained.", err)