librenms-librenms/html/includes/graphs/application/ntp-server_stratum.inc.php

<?php

require 'includes/graphs/common.inc.php';

$scale_min       = 0;
$ds              = 'stratum';
$colour_area     = 'FFCECE';
$colour_line     = '880000';
$colour_area_max = 'FFCCCC';
$graph_max       = 0;
$unit_text       = 'Stratum';
$ntpdserver_rrd  = rrd_name($device['hostname'], array('app', 'ntp-server', $app['app_id']));

if (rrdtool_check_rrd_exists($ntpdserver_rrd)) {
    $rrd_filename = $ntpdserver_rrd;
}

require 'includes/graphs/generic_simplex.inc.php';