The scheduler plugin now controls the scheduler in use for deploys. Apps will have their DOKKU_SCHEDULER environment variables migrated to the scheduler plugin, after which that value will be removed from said app. Please see the scheduler documentation for more information.
The deploy-source metadata from apps:report is now no longer computed on the fly, but hydrated at deploy time via the deploy-source-set trigger. This value may be empty until your next deploy.
Additionally, the deploy-source trigger has now been removed.