docs: @Override
      public String getReportTitleAugmentation(TitleAndCount[] items) {
          // If only 1 item, don't augment the title
          if (items.length == 1) {
              return null;
          }
          String title = null;
          int singleValues = 0;
          for (TitleAndCount item : items) {
              if (item.getCriteriaValuesSelected() == 1) {
                  singleValues++;
                  title =
                          title == null
                                  ? item.getCriteriaItem()
                                  : title + displaySeparator + item.getCriteriaItem();
              }
          }
          // If all items have 1 value selected, return only items 2 and beyond.
          // Item 1 will be a column separator.
          if (singleValues == items.length) {
              return title.substring(title.indexOf(displaySeparator) + displaySeparator.length());
          }
          return title;
      }