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

<?php

$scale_min = '0';
$scale_max = '10';

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

$rrd_options .= " COMMENT:'                            Min   Max   Last\\n'";
$rrd_options .= " DEF:sensor=$rrd_filename:sensor:AVERAGE";
$rrd_options .= " LINE1.5:sensor#cc0000:'".rrdtool_escape($sensor['sensor_descr'], 21)."'";
$rrd_options .= ' GPRINT:sensor:MIN:%4.1lf';
$rrd_options .= ' GPRINT:sensor:MAX:%4.1lf';
$rrd_options .= ' GPRINT:sensor:LAST:%4.1lf\\\\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';
}