code: @Override
      public List<Metric> transform(QueryContext context, List<Metric> metrics) {
          if (metrics.size() == 1) {
              return rangeOfOneMetric(metrics.get(0));
          } else {
              return new MetricReducerOrMappingTransform(new RangeValueReducerOrMapping()).transform(context, metrics);
          }
      }
docs: ~ Methods **************************************************************************************************************************************