Changelog/release notes visibility

[cy6erskunk]

I've just accidentally found that packageRules.packageNames is now considered an invalid config option according to the renovate-config-validator.
It seems to be working in the GitHub app, so I checked the docs, but there's no packageNames field description anymore.
I did some searching to find the release and learned from the #6939 about #6805.
Is there any place where this type of changes could be tracked?
Is there a way to learn which version is now deployed in the GitHub app?
Would it be possible to preseve some information about deprecated config options?

[rarkins]

The app contains a migration script to make it invisible there, and we plan to one day raise Pull Requests to migrate the config in each repo too.

Currently the validator is strict and doesn't perform the migration before validating, but we plan to fix/improve that.

In the end, the only time you should need to know about migrated params in future is when you get a PR saying to migrate you config .

[rarkins]

This PR should fix it once merged: #8503

[cy6erskunk]

This is a great plan!
However, I'm thinking about shared configs in separate repositories: how would it be possible to migrate those?