code: func AddToScheme(scheme *runtime.Scheme) {
  	utilruntime.Must(kubeadm.AddToScheme(scheme))
  	utilruntime.Must(v1beta1.AddToScheme(scheme))
  	utilruntime.Must(v1beta2.AddToScheme(scheme))
  	utilruntime.Must(scheme.SetVersionPriority(v1beta2.SchemeGroupVersion))
  }
docs: // AddToScheme builds the kubeadm scheme using all known versions of the kubeadm api.