Date after = new Date(System.currentTimeMillis());
        // legacy metadata did not have "versioning.snapshotVersions"
        addSnapshotVersionLegacy(target.getVersioning(), before, 1);
        addSnapshotVersionLegacy(source.getVersioning(), after, 2);
        // although nothing has changed merge returns true, as the last modified date is equal
        // TODO: improve merge here?