docs: public Long getInsertCountAvg() {
          Long insertCountAvg = 0L;
          if (items.size() != 0) {
              for (TableStat item : items) {
                  if (item.getEndTime().equals(item.getStartTime())) {
                      insertCountAvg += item.getInsertCount();
                  } else {
                      insertCountAvg += item.getInsertCount() * 1000
                                        / (item.getEndTime().getTime() - item.getStartTime().getTime());
                  }
              }
              insertCountAvg = insertCountAvg / items.size();
          }
          return insertCountAvg;
  
      }