@Override
    public Map<String, SinkMetricData> getSubSinkMetricMap() {
        return this.topicSinkMetricMap;
    }
register sub sink metrics group from metric state

@param metricState MetricState
inlong-sort/sort-flink/base/src/main/java/org/apache/inlong/sort/base/metric/sub/SinkTopicMetricData.java