For an existing router that someone edits and republishes, we'd introduce an optional 'comments' box so admins can describe what change they made and why. We'd then have to offer some kind of 'activity log' within the router to surface. That way people can leave notes for other admins to see what changes were made and why.

Chameleon does this quite well - here's a short walkthrough of what that looks like: https://www.loom.com/share/a2712f0e0efb4c059dd5aa5babe9e9cb?sid=9e4b1d9b-8c66-4588-b962-1b94e0a3ec92