code: def _aggregations_config(self):
          
          result = {}
          for ep in iter_entry_points(
                  group=self.entry_point_group_aggs):
              for cfg in ep.load()():
                  if cfg['aggregation_name'] not in self.enabled_aggregations:
                      continue
                  elif cfg['aggregation_name'] in result:
                      raise DuplicateAggregationError(
                          'Duplicate aggregation {0} in entry point '
                          '{1}'.format(cfg['event_type'], ep.name))
                  # Update the default configuration with env/overlay config.
                  cfg.update(
                      self.enabled_aggregations[cfg['aggregation_name']] or {}
                  )
                  result[cfg['aggregation_name']] = cfg
          return result
docs: Load aggregation configurations.