Indicate the number of affected children by a particular parent

library/Icingadb/Common/IcingaRedis.php

@@ -8,6 +8,7 @@
 use Generator;
 use Icinga\Application\Config;
 use Icinga\Application\Logger;
+use ipl\Sql\Expression;
 use Predis\Client as Redis;
 
 class IcingaRedis
@@ -163,7 +164,16 @@ protected static function fetchState(string $key, array $ids, array $columns): G
         foreach ($results as $i => $json) {
             if ($json !== null) {
                 $data = json_decode($json, true);
-                $keyMap = array_fill_keys($columns, null);
+                $keyMap = [];
+
+                foreach ($columns as $alias => $column) {
+                    if ($column instanceof Expression) {
+                        $column = $alias;
+                    }
+
+                    $keyMap[] = $column;
+                }
+
                 unset($keyMap['is_overdue']); // Is calculated by Icinga DB, not Icinga 2, hence it's never in redis
 
                 // TODO: Remove once https://github.com/Icinga/icinga2/issues/9427 is fixed

library/Icingadb/Common/Icons.php

@@ -10,6 +10,8 @@ class Icons
 
     const HOST_DOWN = 'sitemap';
 
+    const UNREACHABLE = 'sitemap';
+
     const IN_DOWNTIME = 'plug';
 
     const IS_ACKNOWLEDGED = 'check';

library/Icingadb/Model/Host.php

@@ -13,6 +13,7 @@
 use ipl\Orm\Model;
 use ipl\Orm\Relations;
 use ipl\Orm\ResultSet;
+use ipl\Sql\Expression;
 
 /**
  * Host model.
@@ -56,6 +57,7 @@
  * @property ?string $zone_id
  * @property string $command_endpoint_name
  * @property ?string $command_endpoint_id
+ * @property ?int $affected_children
  */
 class Host extends Model
 {
@@ -111,7 +113,8 @@ public function getColumns()
             'zone_name',
             'zone_id',
             'command_endpoint_name',
-            'command_endpoint_id'
+            'command_endpoint_id',
+            'affected_children'
         ];
     }
 
@@ -155,7 +158,8 @@ public function getColumnDefinitions()
             'zone_name'                 => t('Zone Name'),
             'zone_id'                   => t('Zone Id'),
             'command_endpoint_name'     => t('Endpoint Name'),
-            'command_endpoint_id'       => t('Endpoint Id')
+            'command_endpoint_id'       => t('Endpoint Id'),
+            'affected_children'         => t('Affected Children'),
         ];
     }
 

library/Icingadb/Model/HostState.php

@@ -53,7 +53,8 @@ public function getColumnDefinitions()
             'last_update'                   => t('Host Last Update'),
             'last_state_change'             => t('Host Last State Change'),
             'next_check'                    => t('Host Next Check'),
-            'next_update'                   => t('Host Next Update')
+            'next_update'                   => t('Host Next Update'),
+            'affects_children'              => t('Host Affects Children'),
         ];
     }
 

library/Icingadb/Model/Service.php

@@ -13,6 +13,7 @@
 use ipl\Orm\Model;
 use ipl\Orm\Relations;
 use ipl\Orm\ResultSet;
+use ipl\Sql\Expression;
 
 /**
  * @property string $id
@@ -51,6 +52,7 @@
  * @property ?string $zone_id
  * @property string $command_endpoint_name
  * @property ?string $command_endpoint_id
+ * @property ?int $affected_children
  */
 class Service extends Model
 {
@@ -103,7 +105,8 @@ public function getColumns()
             'zone_name',
             'zone_id',
             'command_endpoint_name',
-            'command_endpoint_id'
+            'command_endpoint_id',
+            'affected_children'
         ];
     }
 
@@ -144,7 +147,8 @@ public function getColumnDefinitions()
             'zone_name'                 => t('Zone Name'),
             'zone_id'                   => t('Zone Id'),
             'command_endpoint_name'     => t('Endpoint Name'),
-            'command_endpoint_id'       => t('Endpoint Id')
+            'command_endpoint_id'       => t('Endpoint Id'),
+            'affected_children'         => t('Affected Children')
         ];
     }
 

library/Icingadb/Model/ServiceState.php

@@ -55,7 +55,8 @@ public function getColumnDefinitions()
             'last_update'                   => t('Service Last Update'),
             'last_state_change'             => t('Service Last State Change'),
             'next_check'                    => t('Service Next Check'),
-            'next_update'                   => t('Service Next Update')
+            'next_update'                   => t('Service Next Update'),
+            'affects_children'              => t('Service Affects Children'),
         ];
     }
 

library/Icingadb/Model/State.php

@@ -11,6 +11,7 @@
 use ipl\Orm\Behavior\MillisecondTimestamp;
 use ipl\Orm\Behaviors;
 use ipl\Orm\Model;
+use ipl\Sql\Expression;
 use ipl\Web\Widget\Icon;
 
 /**
@@ -48,6 +49,7 @@
  * @property DateTime $last_state_change The time when the node last got a status change
  * @property DateTime $next_check The time when the node will execute the next check
  * @property DateTime $next_update The time when the next check of the node is expected to end
+ * @property bool $affects_children Whether any of the children is affected if there is a problem
  */
 abstract class State extends Model
 {
@@ -98,7 +100,8 @@ public function getColumns()
             'last_update',
             'last_state_change',
             'next_check',
-            'next_update'
+            'next_update',
+            'affects_children'
         ];
     }
 
@@ -111,7 +114,8 @@ public function createBehaviors(Behaviors $behaviors)
             'is_flapping',
             'is_overdue',
             'is_acknowledged',
-            'in_downtime'
+            'in_downtime',
+            'affects_children'
         ]));
 
         $behaviors->add(new MillisecondTimestamp([

library/Icingadb/Widget/ItemList/StateListItem.php

@@ -13,6 +13,7 @@
 use ipl\Html\HtmlElement;
 use ipl\Web\Common\BaseListItem;
 use ipl\Web\Widget\EmptyState;
+use ipl\Web\Widget\StateBadge;
 use ipl\Web\Widget\TimeSince;
 use ipl\Html\BaseHtmlElement;
 use ipl\Html\Html;
@@ -93,6 +94,23 @@ protected function assembleTitle(BaseHtmlElement $title): void
             $this->createSubject(),
             Html::tag('span', ['class' => 'state-text'], $this->state->getStateTextTranslated())
         ));
+
+        if ($this->state->affects_children) {
+            $total = $this->item->affected_children;
+
+            if ((int) $total > 1000) {
+                $total = '1000+';
+            }
+
+            $icon = new Icon(Icons::UNREACHABLE);
+
+            $title->addHtml((new StateBadge([$icon, Text::create($total)], ''))
+                ->addAttributes([
+                    'class' => 'affected-objects',
+                    'title' => sprintf(t('Up to %s affected objects'), $total)
+                ])
+            );
+        }
     }
 
     protected function assembleVisual(BaseHtmlElement $visual): void

public/css/common.less

@@ -403,3 +403,11 @@ div.show-more {
 form[name="form_confirm_removal"] {
   text-align: center;
 }
+
+.affected-objects {
+  display: inline-flex;
+  align-items: baseline;
+  background-color: @state-critical;
+  color: @default-text-color-inverted;
+  padding: 0 0.25em;
+}