Now that we have data model services (and numerous other components), we need to automatically generate a change log of what changes (including in components) are new to a deployment branch vs previous branch.

ideally this should also find DEPLOY notes and referenced bugs, which need for our deployment notes and calendar.

I used to mainly look at the git log for Wikibase (sometimes with --grep) and that was enough. I also looked at my gerrit dashboard at the list of merged changes. I think we reached a point with our components that we need another, better solution.

When a new branch gets deployed, we need to be aware of what changes are actually going out, if cache epoch needs to be bumped or other config changes, and users should be informed of important, relevant changes.