@Override
  public boolean evaluate(Number[] params) {
    return super.evaluate(params)
        && (isGreaterThan(params[0], upperLimit) || isLessThan(params[0], lowerLimit));
  }
This eval just applies to a single value or the 1st value in params
geode-core/src/main/java/org/apache/geode/internal/admin/statalerts/GaugeThresholdDecoratorImpl.java