used to permit a SecretObjectReference: \n * Gateway \n When
                        used to permit a BackendObjectReference: \n * GRPCRoute *
                        HTTPRoute * TCPRoute * TLSRoute * UDPRoute"
                      maxLength: 63
                      minLength: 1
                      pattern: ^[a-zA-Z]([-a-zA-Z0-9]*[a-zA-Z0-9])?$
                      type: string
                    namespace: