[8.x] Raise ScheduledBackgroundTaskFinished event to signal when a run in background task finishes

src/Illuminate/Console/Events/ScheduledBackgroundTaskFinished.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Illuminate\Console\Events;
+
+use Illuminate\Console\Scheduling\Event;
+
+class ScheduledBackgroundTaskFinished
+{
+    /**
+     * The scheduled event that ran.
+     *
+     * @var \Illuminate\Console\Scheduling\Event
+     */
+    public $task;
+
+    /**
+     * Create a new event instance.
+     *
+     * @param  \Illuminate\Console\Scheduling\Event  $task
+     * @return void
+     */
+    public function __construct(Event $task)
+    {
+        $this->task = $task;
+    }
+}

src/Illuminate/Console/Scheduling/ScheduleFinishCommand.php

@@ -3,6 +3,8 @@
 namespace Illuminate\Console\Scheduling;
 
 use Illuminate\Console\Command;
+use Illuminate\Console\Events\ScheduledBackgroundTaskFinished;
+use Illuminate\Contracts\Events\Dispatcher;
 
 class ScheduleFinishCommand extends Command
 {
@@ -37,6 +39,10 @@ public function handle(Schedule $schedule)
     {
         collect($schedule->events())->filter(function ($value) {
             return $value->mutexName() == $this->argument('id');
-        })->each->callAfterCallbacksWithExitCode($this->laravel, $this->argument('code'));
+        })->each(function ($event) {
+            $event->callafterCallbacksWithExitCode($this->laravel, $this->argument('code'));
+
+            $this->laravel->make(Dispatcher::class)->dispatch(new ScheduledBackgroundTaskFinished($event));
+        });
     }
 }