code: public static ApacheLog add(ApacheLog logA, ApacheLog logB)
      {
          String key = logA.getKey();
          if (StringUtils.isEmpty(key) == true)
          {
              key = logB.getKey();
          }
          long countSum = logA.getCount() + logB.getCount();
          long sizeSum = logA.getSizeSum() + logB.getSizeSum();
          long timeSum = logA.getTimeSum() + logB.getTimeSum();
          Date recordedTime = logA.getRecordedTime();
          double anomalyScore = Math.max(logA.getAnomalyScore(), logB.getAnomalyScore());
  
          ApacheLog result = new ApacheLog(key, countSum, sizeSum, timeSum, recordedTime,
                  anomalyScore);
          return result;
      }
docs: ApacheLogオブジェクトを加算し、加算した結果をもとに新たなApacheResponseオブジェクトを生成する。
  
  @param logA 加算対象ApacheLog
  @param logB 加算対象ApacheLog
  @return 加算結果加算対象ApacheLog