docs: public String histogram() {
          Long costs = 0L;
          Long items = 0L;
          Long max = 0L;
          Long min = Long.MAX_VALUE;
          Long tps = 0L;
          Long tpm = 0L;
          Long avg = 0L;
  
          Long lastTime = 0L;
          Long tpsCount = 0L;// 记录每秒的请求数，临时变量
          Long tpsTotal = 0L;// 总tps数多少
          Long tpsSecond = 0L;// 多少秒中有数据
  
          Long tpmCount = 0L; // 记录每分钟的请求数，临时变量
          Long tpmTotal = 0L; // 总tps数多少
          Long tpmMinute = 0L;// 多少分钟有数据
          for (int i = 0; i < table.length; i++) {
              AggregationItem aggregation = table[i];
              if (aggregation != null) {
                  Long cost = aggregation.getEndTime() - aggregation.getStartTime();
                  items += 1;
                  costs += cost;
                  if (cost > max) {
                      max = cost;
                  }
                  if (cost < min) {
                      min = cost;
                  }
  
                  if (lastTime != 0) {
                      if (lastTime > aggregation.getEndTime() - ONE_SECOND) {// 说明在同一秒
                          tpsCount++;
                      } else {
                          tpsTotal += tpsCount;
                          tpsSecond++;
                          tpsCount = 0L;
                      }
  
                      if (lastTime > aggregation.getEndTime() - ONE_MINUTE) {// 说明在同一分钟
                          tpmCount++;
                      } else {
                          tpmTotal += tpmCount;
                          tpmMinute++;
                          tpmCount = 0L;
                      }
  
                  }
  
                  lastTime = aggregation.getEndTime();
              }
          }
          // 设置一下最后一批tps/m统计信息
          tpsTotal += tpsCount;
          tpsSecond++;
          tpsCount = 0L;
          tpmTotal += tpmCount;
          tpmMinute++;
          tpmCount = 0L;
  
          if (items != 0) {
              avg = costs / items;
          }
  
          if (tpsSecond != 0) {
              tps = tpsTotal / tpsSecond;
          }
  
          if (tpmMinute != 0) {
              tpm = tpmTotal / tpmMinute;
          }
  
          if (min == Long.MAX_VALUE) {
              min = 0L;
          }
  
          return String.format(HISTOGRAM_FORMAT, new Object[] { sequence.get() + 1, items, max, min, avg, tps, tpm });
      }