$fields = [
        'files_written' => $returned['pkg_stats'][$pkg]['files_written'],
        's0files_written' => $returned['pkg_stats'][$pkg]['min.files_written'],
        's1files_written' => $returned['pkg_stats'][$pkg]['max.files_written'],
        's2files_written' => $returned['pkg_stats'][$pkg]['range.files_written'],