docs: def add_result(self, values):
          """
          Add a tuple or increment the value of an existing one
          in the rule results dictionary.
          """
          idx = [values['host']]
          for gid in self.key_gids[1:]:
              idx.append(values[gid])
          idx = tuple(idx)
  
          try:
              self.results[idx] += 1
          except KeyError:
              self.results[idx] = 1
          self._last_idx = idx