default Gauge registerGauge(String metricName, Gauge gauge) {
        MetricGroup inlongMetricGroup = getMetricGroup();
        for (Map.Entry<String, String> label : getLabels().entrySet()) {
            inlongMetricGroup = inlongMetricGroup.addGroup(label.getKey(), label.getValue());
        }
        return inlongMetricGroup.gauge(metricName, gauge);
    }
Register a gauge metric

@param metricName The gauge name
@return Gauge of registered
inlong-sort/sort-flink/base/src/main/java/org/apache/inlong/sort/base/metric/MetricData.java