add Suricata monitoring (#13942)

* add poller

* add a generic alert graph

* add support for .total

* add the initial work on the suricata app page

* add applayer flow sources

* more rrd work and add more fields

* add a missing graph to the suricata page

* add suricata to the apps page

* all working now for suricata

* add some suricata alert examples

* all done with the php

* update the application docs for Suricata

* add another note about Suricata stats in the docs

* add the test file

* add the test JSON

* remove a unneeded newline from the appication docs

* correct the type uptime type

* packets graph should by packets/sec

* minor formatting cleanup

* one more minor formatting cleanup

* shot in the dark to see if something fixes the angry linter

* fix snmpsim file

* add metrics

* add values to the metrics

* add a missing comma to the json

* add a missing line to snmprec and cleanup json a bit

* a few more minor changes to see if this makes it happy... regened via scripts/json-app-tool.php

* see if this will make it happy

* add suricata to app discovery and hope that fixes it... take a shot in the dark as to why the linter errors strangely on two of the files

* fix json

* add a missing ] to the json

* rename two graphs so it does not trigger one alert and add a missing metric

* whoops, *_alertString is not a metric

includes/html/functions.inc.php

@@ -1324,6 +1324,33 @@ function get_sensor_label_color($sensor, $type = 'sensors')
     return "<span class='label $label_style'>" . trim(Number::formatSi($sensor['sensor_current'], 2, 3, $unit)) . '</span>';
 }
 
+/**
+ * Returns a list of the various suricata instances for
+ * the specified device id.
+ *
+ * @param $device_id
+ * @return array
+ */
+function get_suricata_instances($device_id)
+{
+    $options = [
+        'filter' => [
+            'type' => ['=', 'suricata'],
+        ],
+    ];
+
+    $component = new LibreNMS\Component();
+    $ourc = $component->getComponents($device_id, $options);
+
+    if (isset($ourc[$device_id])) {
+        $id = $component->getFirstComponentID($ourc, $device_id);
+
+        return json_decode($ourc[$device_id][$id]['instances']);
+    }
+
+    return [];
+}
+
 /**
  * @params int unix time
  * @params int seconds