Don't send notifications when within maintenance window. Fixes #2720

app/Integrations/Core/System.php

@@ -14,6 +14,7 @@ namespace CachetHQ\Cachet\Integrations\Core;
 use CachetHQ\Cachet\Integrations\Contracts\System as SystemContract;
 use CachetHQ\Cachet\Models\Component;
 use CachetHQ\Cachet\Models\Incident;
+use CachetHQ\Cachet\Models\Schedule;
 use Illuminate\Contracts\Auth\Guard;
 use Illuminate\Contracts\Config\Repository;
 
@@ -102,6 +103,16 @@ class System implements SystemContract
         return $status;
     }
 
+    /**
+     * Determine if Cachet has any open maintenance windows.
+     *
+     * @return bool
+     */
+    public function underMaintenance()
+    {
+        return Schedule::inProgress()->count() > 0;
+    }
+
     /**
      * Get the cachet version.
      *