Here's a short overview about the changes found in version 4.9.0:

* Type __docker_stack: Use --with-registry-auth option (Ľubomír Kučera)
* New type: __docker_config (Ľubomír Kučera)
* New type: __docker_secret (Ľubomír Kučera)
* Type __letsencrypt_cert: Rewritten; WARN: breaks backward compatibility (Ľubomír Kučera)
* Core: Fix NameError: name 'cdist_object' is not defined (Darko Poljak)

For more information visit the cdist homepage.