code: protected void handleStatsResetIfNeeded(StatusData<ApacheMetrics> status) {
          StatValue uptime = getStatValue(ApacheMetrics.SERVER_UPTIME);
          Long currUptime = Long.class.cast(status.get(ApacheMetrics.SERVER_UPTIME));
          if (uptime != null && currUptime != null && uptime.getValueAsLong() > currUptime) {
              for (ApacheMetrics metric : getAvailableMetrics()) {
                  if (metric.getType() == StatValueTypes.DIFFLONG) {
                      StatValue stat = getStatValue(metric);
                      if (stat != null)
                          stat.reset();
                  }
              }
          }
      }
docs: Check SERVER_UPTIME metric and if its value is lower than the stored one -
  monitored apache server was restarted. In this case all DIFFLONG statValues
  need resetting.
  
  @param status latest status data.