librenms-librenms/doc/Developing/os/Custom-Graphs.md

source: Developing/os/Custom-Graphs.md
path: blob/master/doc/

First we define our graphs in `includes/definitions.inc.php` to share our work and contribute in the development of LibreNMS. :-) (or place in `config.php` if you don't plan to contribute)

```php
// Pulse Secure Graphs
$config['graph_types']['device']['pulse_sessions'] = ['section' => 'firewall', 'order' => 0, 'descr' => 'Active Sessions'];
$config['graph_types']['device']['pulse_users'] = ['section' => 'firewall', 'order' => 0, 'descr' => 'Active Users'];
```

#### Polling OS

OS polling is not necessarily where custom polling should be done, please speak to one of the core devs in [Discord](https://t.libren.ms/discord) for guidance.

Let's update our example file to add additional polling:

```bash
includes/polling/os/pulse.inc.php
```
We declare two specific graphs for users and sessions numbers. Theses two graphs will be displayed on the firewall section of the graphs tab as it was written in the definition include file.

```php
<?php

use LibreNMS\RRD\RrdDefinition;

$users = snmp_get($device, 'iveConcurrentUsers.0', '-OQv', 'PULSESECURE-PSG-MIB');

if (is_numeric($users)) {
    $rrd_def = RrdDefinition::make()->addDataset('users', 'GAUGE', 0);

    $fields = array(
        'users' => $users,
    );

    $tags = compact('rrd_def');
    data_update($device, 'pulse_users', $tags, $fields);
    $graphs['pulse_users'] = true;
}

$sessions = snmp_get($device, 'iveConcurrentUsers.0', '-OQv', 'PULSESECURE-PSG-MIB');

if (is_numeric($sessions)) {
    $rrd_def = RrdDefinition::make()->addDataset('sessions', 'GAUGE', 0);

    $fields = array(
        'sessions' => $sessions,
    );

    $tags = compact('rrd_def');
    data_update($device, 'pulse_sessions', $tags, $fields);
    $graphs['pulse_sessions'] = true;
}
```

#### Displaying

The specific graphs are not displayed automatically so we need to write the following PHP code:

**Pulse Sessions**

```bash
html/includes/graphs/device/pulse_sessions.inc.php
```

```php
<?php

$rrd_filename = rrd_name($device['hostname'], 'pulse_sessions');

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

$ds = 'sessions';

$colour_area = '9999cc';
$colour_line = '0000cc';

$colour_area_max = '9999cc';

$graph_max = 1;
$graph_min = 0;

$unit_text = 'Sessions';

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

**Pulse Users**

```bash
html/includes/graphs/device/pulse_users.inc.php
```

```php
<?php

$rrd_filename = rrd_name($device['hostname'], 'pulse_users');

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

$ds = 'users';

$colour_area = '9999cc';
$colour_line = '0000cc';

$colour_area_max = '9999cc';

$graph_max = 1;

$unit_text = 'Users';

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

That should be it, after data has started to be collected graphs should appear in the WebUI.