In sidekiq 6.0 it will no longer be possible to use sidekiq with parameter `-d`, to daemonize it. This is the warning you'll get when starting GDK: ``` 16:57:45 rails-background-jobs.1 | WARNING: PID file creation will be removed in Sidekiq 6.0, see #4045. Please use a proper process supervisor to start and manage your services ``` There referred issue is here: https://github.com/mperham/sidekiq/issues/4045 --- I think only GDK uses the `bin/background_jobs` script in gitlab-ce/ee, so I guess GDK needs to be changed.