FYI about a google sheet I created to keep track of features we've released that are not at 'default` stability.

This is basically intended as a reference for people who work on various technical areas and may want to help get things promoted. Particularly things at `preview` level, where we get a big jump in visibility by getting them to `community` level.

Edits of this are locked down. If something is wrong let me know. It's pretty easy for me to maintain as I write about these things as part of the release announcement for our Final releases. I don't intend to update it with any new features or promotions except around that time.