docs: def p_throttling(p):
      """
      throttling : THROTTLING COLON NONE
                 | THROTTLING COLON TAIL_DROP OPEN_BRACKET NUMBER CLOSE_BRACKET
      """
      throttling = NoThrottlingSettings()
      if len(p) == 7:
          throttling = TailDropSettings(int(p[5]))
      p[0] = {"throttling": throttling}