code: def log_fail(self, item: str) -> None:
          
          assert item is not None
          item = self._encode_item(item)
          if self.is_blocked(item):
              return
          connection = self.__get_connection()
          key = self.__redis_conf['watchlist_template'].format(item)
          value = connection.get(key)
          if value is None:
              connection.set(key, 1, ex=self.__redis_conf['watchlist_ttl'])
              BlackRed.__release_connection(connection)
              return
          value = int(value) + 1
          if value < self.__redis_conf['watchlist_to_blacklist']:
              connection.set(key, value, ex=self.__redis_conf['watchlist_ttl'])
              BlackRed.__release_connection(connection)
              return
          blacklist_key = self.__redis_conf['blacklist_template'].format(item)
          connection.set(blacklist_key, time.time(), ex=self.__redis_conf['blacklist_ttl'])
          connection.delete(key)
          BlackRed.__release_connection(connection)
docs: Log a failed action for an item. If the fail count for this item reaches the threshold, the item is moved to the
          blacklist.
  
          :param str item: The item to log