@Override
    public void onMetadataUpdate(
        MetadataDelta delta,
        MetadataImage newImage,
        LoaderManifest manifest
    ) {
        switch (manifest.type()) {
            case LOG_DELTA:
                publishLogDelta(delta, newImage, (LogDeltaManifest) manifest);
                break;
            case SNAPSHOT:
                publishSnapshot(delta, newImage, (SnapshotManifest) manifest);
                break;
        }
    }
The time at which we created the last snapshot.
metadata/src/main/java/org/apache/kafka/image/publisher/SnapshotGenerator.java