Global has been removed in 3.0.0. quantum-core/CHANGELOG.md at 0ac628950b8de0a03ed914f1ca0c77c9ad93c4ac · quantum-elixir/quantum-core · GitHub
which is kind of soliving the problem because the implementation wasn’t great and was causing us a lot of trouble with unexpected behavior.
You probably want to use Oban, which will guarantee scheduled jobs uniqueness on the PostgreSQL level:
https://github.com/sorentwo/oban#periodic-jobs
You can also use something like GitHub - SchedEx/SchedEx: Simple scheduling for Elixir · GitHub but you will have to wrap it with own code to make only one process in cluster is started per job, I have been doing that with Horde.DynamicSupervisor. But honestly, if asked to implement it today, I would just use Oban.
