librenms-librenms/includes/html/pages/device/nfsen/general.inc.php

<?php

$datas = array(
          'Flows'   => 'nfsen_flows',
          'Packets' => 'nfsen_packets',
          'Traffic' => 'nfsen_traffic',
         );

foreach ($datas as $name => $type) {
    $graph_title = $name;
    $graph_type  = 'device_'.$type;

    include 'includes/html/print-device-graph.php';
}