Logsize monitoring for LibreNMS (#15137)

* add logsize poller

* add set size info

* add more stats

* add min size

* more logsize files

* add logsize

* fix creating log file links

* add two new graphs

* add some graphs

* add no_minus_d

* add no minus d to app page

* add count of log files

* save logsizes in app data

* rename title log sizes

* only show top 12

* add mean median and mode

* cleanup naming a bit

* the values for the files hash is now a int instead of another hash

* add new stats and correct median name

* now properly handle unseen

* fix logsize bits

* add combined

* update metrics and add some tests

* add logsize graphs to apps page

* add the logsize bit

* add logszie docs

* add some example alert rules

* style cleanup

* more style cleanup

* fix a few things for metrics and update the test

* fix a variable name in the test and update the data

includes/html/pages/apps.inc.php

@@ -457,6 +457,15 @@ $graphs['wireguard'] = [
     'traffic',
     'time',
 ];
+$graphs['logsize'] = [
+    'size',
+    'set_sizes',
+    'max_size',
+    'mean_size',
+    'median_size',
+    'mode_size',
+    'min_size',
+];
 $graphs['linux_config_files'] = [
     'number_of_confs',
 ];

includes/html/pages/device/apps/logsize.inc.php

@@ -0,0 +1,106 @@
+<?php
+
+$link_array = [
+    'page'   => 'device',
+    'device' => $device['device_id'],
+    'tab'    => 'apps',
+    'app'    => 'logsize',
+];
+
+$no_minus_d = $app->data['no_minus_d'] ?? false;
+
+print_optionbar_start();
+
+echo generate_link('Basics', $link_array);
+echo ' | Sets:';
+$sets = $app->data['sets'] ?? [];
+$sets_list = array_keys($sets);
+sort($sets_list);
+foreach ($sets_list as $index => $log_set) {
+    $label = $vars['log_set'] == $log_set
+        ? '<span class="pagemenu-selected">' . $log_set . '</span>'
+        : $log_set;
+
+    echo generate_link($label, $link_array, ['log_set' => $log_set]) . "\n";
+
+    if ($index < (count($sets_list) - 1)) {
+        echo ', ';
+    }
+}
+
+if (isset($vars['log_set']) && isset($sets[$vars['log_set']])) {
+    $log_files = $sets[$vars['log_set']]['files'];
+    $log_count = count($log_files);
+    echo "<br>\nFiles Count: " . $log_count . "<br>\nFiles: \n";
+    sort($log_files);
+
+    foreach ($log_files as $index => $log_file) {
+        $label = $vars['log_file'] == $log_file
+            ? '<span class="pagemenu-selected">' . $log_file . '</span>'
+            : $log_file;
+
+        echo generate_link($label, $link_array, ['log_set' => $vars['log_set'], 'log_file'=>$log_file]) . "\n";
+
+        if ($index < (count($log_files) - 1)) {
+            echo ', ';
+        }
+    }
+}
+
+print_optionbar_end();
+
+if (isset($vars['log_file']) && isset($vars['log_set'])) {
+    $graphs = [
+        'logsize_size' => 'Log Size',
+    ];
+} elseif (isset($vars['log_set'])) {
+    $graphs = [
+        'logsize_size' => 'Set Size',
+        'logsize_log_sizes' => 'Log Sizes, Top 12',
+        'logsize_combined_stats' => 'Combined Log Stats',
+        'logsize_max_size' => 'Max Log Size',
+        'logsize_mean_size' => 'Mean Log Size',
+        'logsize_median_size' => 'Median Log Size',
+        'logsize_mode_size' => 'Mode Log Size',
+        'logsize_min_size' => 'Min Log Size',
+    ];
+} else {
+    $graphs = [
+        'logsize_size' => 'Total Size',
+        'logsize_set_sizes' => 'Set Sizes',
+        'logsize_combined_stats' => 'Combined Set Stats',
+        'logsize_max_size' => 'Max Set Size',
+        'logsize_mean_size' => 'Mean Set Size',
+        'logsize_median_size' => 'Median Set Size',
+        'logsize_mode_size' => 'Mode Set Size',
+        'logsize_min_size' => 'Min Set Size',
+    ];
+}
+
+foreach ($graphs as $key => $text) {
+    $graph_type = $key;
+    $graph_array['height'] = '100';
+    $graph_array['width'] = '215';
+    $graph_array['to'] = \LibreNMS\Config::get('time.now');
+    $graph_array['id'] = $app['app_id'];
+    $graph_array['type'] = 'application_' . $key;
+
+    if (isset($vars['log_set'])) {
+        $graph_array['log_set'] = $vars['log_set'];
+    }
+
+    if (isset($vars['log_file'])) {
+        $graph_array['log_file'] = $vars['log_file'];
+    }
+
+    echo '<div class="panel panel-default">
+    <div class="panel-heading">
+        <h3 class="panel-title">' . $text . '</h3>
+    </div>
+    <div class="panel-body">
+    <div class="row">';
+    include 'includes/html/print-graphrow.inc.php';
+    echo '</div>';
+    echo '</div>';
+    echo '</div>';
+}