During the 1.9.0 release process, we missed quite a few configuration updates in docs/_config.yml related to Flink versions. This should be able to be done automatically in via the release scripts.
A list of settings in that file that needs to be touched on every major release include:
- Add new link to previous_docs
This can probably be done via the tools/releasing/create_release_branch.sh script, which is used for every major release.
We should also update the release guide in the project wiki to cover checking that file as an item in checklists.