feature: add fail2ban application support (#5924)

* add single pool based poller for php-fpm

* add the page for php-fpm

* add graph for php-fpm

* I agree to the conditions of the Contributor Agreement contained in doc/General/Contributing.md.

* use named OID as suggest by @laf

* document PHP-FPM monitoring

* link it in the index

* clean up the named oid

* add how to grab the script in question

* add f2b poller

* add f2b app page

* add f2b graph

* add fail2ban notes

* minor formatting cleanup

* ...more formatting cleanup

* rename it so it can be called via the app page

* Revert "rename it so it can be called via the app page"

This reverts commit 0bde88a038.

* *rename it so it can be called via the apps page
*setup the apps page to call it

* renamed the graph

* now include fail2ban in the apps properly

* correct the wget command so it does not stomp on phpfpm-sp

* update the fail2ban poller for the newest fail2ban script and now build multiple RRDs

* update for now graphing firewalled and banned

* update fail2ban docs to match the newest snmpd extend method

* search automatically for jails and graph them

* graphs the currently banned for a fail2ban jail

* change the tital of the graph for the total banned to make it more descriptive

* Add a explanation of the two variables in the total graph.

* misc. white space cleans ups

* misc. white space cleanup

* minor white space cleanup

* correct descr lenght

* correct descr lenght

* Update fail2ban.inc.php

* Use rrd_name properly

* note the cache file bits

* make caching optional and note why

* Update to new RrdDefinition class

* And the use statement ;/

* Messed the second rrd_def

* correct two minor errors that did not seem to be causing issues

* don't use $vars as per pull #5994

* don't use $vars as per pull #5994

* fix jails graphs

* Remove loops and temp variables

* whitespace

* Change graph so we don't get fractions

html/includes/graphs/application/fail2ban_banned.inc.php

@@ -0,0 +1,35 @@
+<?php
+require 'includes/graphs/common.inc.php';
+$scale_min     = 0;
+$colours       = 'mixed';
+$unit_text     = 'Banned IPs';
+$unitlen       = 10;
+$bigdescrlen   = 10;
+$smalldescrlen = 10;
+$dostack       = 0;
+$printtotal    = 0;
+$addarea       = 1;
+$transparency  = 15;
+
+$rrd_filename = rrd_name($device['hostname'], array('app', $app['app_type'], $app['app_id']));
+
+if (is_file($rrd_filename)) {
+    $rrd_list = array(
+        array(
+            'filename' => $rrd_filename,
+            'descr'    => 'Banned',
+            'ds'       => 'banned',
+            'colour'   => '582A72'
+        ),
+        array(
+            'filename' => $rrd_filename,
+            'descr'    => 'Firewalled',
+            'ds'       => 'firewalled',
+            'colour'   => '28774F'
+        )
+    );
+} else {
+    echo "file missing: $rrd_filename";
+}
+
+require 'includes/graphs/generic_v3_multiline.inc.php';

html/includes/graphs/application/fail2ban_jail.inc.php

@@ -0,0 +1,28 @@
+<?php
+require 'includes/graphs/common.inc.php';
+$scale_min     = 0;
+$colours       = 'mixed';
+$unit_text     = ' ';
+$unitlen       = 10;
+$bigdescrlen   = 10;
+$smalldescrlen = 10;
+$dostack       = 0;
+$printtotal    = 0;
+$addarea       = 1;
+$transparency  = 15;
+
+$rrd_filename = rrd_name($device['hostname'], array('app', $app['app_type'], $app['app_id'], $vars['jail']));
+if (rrdtool_check_rrd_exists($rrd_filename)) {
+    $rrd_list = array(
+        array(
+            'filename' => $rrd_filename,
+            'descr'    => 'Banned IPs',
+            'ds'       => 'banned',
+            'colour'   => '582A72'
+        )
+    );
+} else {
+    echo "file missing: $rrd_filename";
+}
+
+require 'includes/graphs/generic_v3_multiline.inc.php';