What happened to Package Development / Add-Ons?

Hi,
I just wanted to use zammad in a new project and thought of implementing some additional functionality using the feature of “packages” or “addons” I remembered from some previous project, but can’t find any documentation on this topic anymore.
What happened here?

Best regards!

There is no documentation about it. You can use the search to find some stuff about it.

Some time ago I made some tutorials which can be found here:

I just want to add: The level of documentation of addons has improved in the past, also documentation wise. But yes, there’s no exact ready to go cookbook except from threads in this community.