@Override
    public void executeRevert(long targetEpoch, Delta delta) {
        LongContainer container = (LongContainer) delta;
        this.value = container.value();
    }
This is a mutable long which can be snapshotted.
<br>
This class requires external synchronization.
server-common/src/main/java/org/apache/kafka/timeline/TimelineLong.java