public MongoDBSourceBuilder<T> metricOption(MetricOption metricOption) {
        this.metricOption = metricOption;
        return this;
    }
The metric option used to collect metrics when inlong.metric.labels is present in flink sql.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/mongodb-cdc/src/main/java/org/apache/inlong/sort/mongodb/source/MongoDBSourceBuilder.java