public void outputMetrics() {
        if (readPhaseTimestamp != null) {
            long count = readPhaseTimestamp.getCount();
            if (count == 0) {
                readPhaseTimestamp.inc(System.currentTimeMillis());
            }
        }
    }
output read phase metric,just keep the time to change that moment
inlong-sort/sort-flink/base/src/main/java/org/apache/inlong/sort/base/metric/phase/ReadPhaseMetricData.java