// refer to the IngressClass documentation.
  // +optional
  optional string ingressClassName = 4;

  // backend is the default backend capable of servicing requests that don't match any
  // rule. At least one of 'backend' or 'rules' must be specified. This field
  // is optional to allow the loadbalancer controller or defaulting logic to
  // specify a global default.
  // +optional

  // refer to the IngressClass documentation.
  // +optional
  optional string ingressClassName = 4;

  // A default backend capable of servicing requests that don't match any
  // rule. At least one of 'backend' or 'rules' must be specified. This field
  // is optional to allow the loadbalancer controller or defaulting logic to
  // specify a global default.
  // +optional

  // reasons, ingress controllers should still honor that annotation if present.
  // +optional
  optional string ingressClassName = 4;

  // defaultBackend is the backend that should handle requests that don't
  // match any rule. If Rules are not specified, DefaultBackend must be specified.
  // If DefaultBackend is not set, the handling of requests that do not match any
  // of the rules will be up to the Ingress controller.