@Override
    public String toString() {
        return "ReadPhaseMetricData{"
                + "metricGroup=" + metricGroup
                + ", labels=" + labels
                + ", readPhaseTimestamp=" + readPhaseTimestamp.getCount()
                + '}';
    }
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