code: def find_postaggs_for(postagg_names, metrics_dict):
          
          postagg_metrics = [
              metrics_dict[name] for name in postagg_names
              if metrics_dict[name].metric_type == POST_AGG_TYPE
          ]
          # Remove post aggregations that were found
          for postagg in postagg_metrics:
              postagg_names.remove(postagg.metric_name)
          return postagg_metrics
docs: Return a list of metrics that are post aggregations