Ever emptied a Laravel queue to clear a backlog? You open the console and type php artisan horizon:clear Then every ShouldBeUnique dispatch after that is silently discarded. And now you have to find the laravel_unique_job:* locks in Redis by hand. That's why Skyline lists held unique locks on their own screen and releases them from the dashboard. And also automatically when you clear a queue containing unique jobs. https://boring-observability.dev/skyline