IncidentDetail: Make the message limit configurable via module config

Author: sukhwinder33445

doc/03-Configuration.md

@@ -36,6 +36,21 @@ If you just installed Icinga Notifications Web, remember to activate it on your
 | notifications/view/contacts      | Allow to view contacts                         |
 | notifications/api                | Allow to modify configuration via API          |
 
+## General Configuration
+
+There is currently one configurable option: the maximum number of characters of the incident
+message shown in the incident detail view (default: 10000). It can not be adjusted in the UI
+directly, but has to be set in the configuration file `/etc/icingaweb2/modules/notifications/config.ini`.
+
+### Example
+
+Setting the incident message character limit to 2500.
+
+```
+[settings]
+incident_message_character_limit = 2500
+```
+
 ## Database Configuration
 
 Connection configuration for the database, which both,

library/Notifications/Widget/Detail/IncidentDetail.php

@@ -5,6 +5,7 @@
 
 namespace Icinga\Module\Notifications\Widget\Detail;
 
+use Icinga\Application\Config;
 use Icinga\Module\Notifications\Common\Auth;
 use Icinga\Module\Notifications\Common\SourceHookLocator;
 use Icinga\Module\Notifications\Model\Incident;
@@ -106,7 +107,13 @@ protected function createMessage(): array
                 'id' => 'persist-collapse-state',
                 'data-visible-height' => 100
             ]),
-            Text::create(substr($this->incident->message, 0, 10000))
+            Text::create(
+                substr(
+                    $this->incident->message,
+                0,
+                    (int) Config::module('notifications')
+                        ->get('settings', 'incident_message_character_limit', 10000))
+            )
         );
 
         CopyToClipboard::attachTo($message);