librenms-librenms/includes/html/graphs/global/poller_perf.inc.php

<?php
/**
 * poller_perf.php
 *
 * -Description-
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @package    LibreNMS
 * @link       http://librenms.org
 * @copyright  2018 Tony Murray
 * @author     Tony Murray <murraytony@gmail.com>
 */

use App\Models\Device;

$scale_min = '0';

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

$cdef = [];
$suffix = '';

foreach (Device::pluck('hostname') as $index => $hostname) {
    $rrd_filename = rrd_name($hostname, 'poller-perf');
    if (rrdtool_check_rrd_exists($rrd_filename)) {
        $rrd_options .= " DEF:pollerRaw$index=$rrd_filename:poller:AVERAGE";
        // change undefined to 0
        $rrd_options .= " CDEF:poller$index=pollerRaw$index,UN,0,pollerRaw$index,IF";
        $cdef[] = 'poller' . $index . $suffix;
        $suffix = ',+';
    }
}

$rrd_options .= " CDEF:poller=" . implode(',', $cdef);
$rrd_options .= " 'COMMENT:Seconds      Cur     Min     Max     Avg\\n'";
$rrd_options .= ' LINE1.25:poller#36393D:Poller';
$rrd_options .= ' GPRINT:poller:LAST:%6.2lf  GPRINT:poller:MIN:%6.2lf';
$rrd_options .= " GPRINT:poller:MAX:%6.2lf  'GPRINT:poller:AVERAGE:%6.2lf\\n'";