librenms-librenms/html/includes/graphs/sensor/fanspeed.inc.php

<?php

$scale_min = '0';

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

$rrd_options .= " COMMENT:'                         Last     Max\\n'";

$rrd_options .= " DEF:sensor=$rrd_filename:sensor:AVERAGE";
$rrd_options .= " LINE1.5:sensor#cc0000:'".rrdtool_escape($sensor['sensor_descr'], 20)."'";
$rrd_options .= ' GPRINT:sensor:LAST:%3.0lfrpm';
$rrd_options .= ' GPRINT:sensor:MAX:%3.0lfrpm\\\\l';

if (is_numeric($sensor['sensor_limit'])) {
    $rrd_options .= ' HRULE:'.$sensor['sensor_limit'].'#999999::dashes';
}

if (is_numeric($sensor['sensor_limit_low'])) {
    $rrd_options .= ' HRULE:'.$sensor['sensor_limit_low'].'#999999::dashes';
}