@Override
      public Integer getValue() {
        long now = System.currentTimeMillis();
        if (now - _lastUpdate > UPDATE_DELAY) {
          _count = AppResult.find.where()
                  .gt(AppResult.TABLE.FINISH_TIME, now - DAY)
                  .findRowCount();
          _lastUpdate = now;
        }
        return _count;
      }
Initializer method for the metrics registry. Call this method before registering
new metrics with the registry.
app/controllers/MetricsController.java