code: def _get_missing_cookie_message_and_metric(self, cookie_name):
          
          cookie_missing_message = '{} cookie is missing. JWT auth cookies will not be reconstituted.'.format(
                  cookie_name
          )
          request_jwt_cookie = 'missing-{}'.format(cookie_name)
          return cookie_missing_message, request_jwt_cookie
docs: Returns tuple with missing cookie (log_message, metric_value)