However, is there a changelog for the CKAN API? It’d be nice as a developer of a client (ckanr) to know what’s changed in just the API, as I want to make sure I don’t miss anything, and to be able to more easily figure out how to make ckanr compatible with all CKAN versions running out there, and there are a lot of different versions: ckan_versions_v2.md · GitHub
Any change will be documented in the changelog you linked to. I don’t think there’s a separate one for just the API, but changes are usually documented in a ‘API changes and deprecations’ section.