Google quietly announced on Google+ that they added conversion changes to the account history page within the AdWords console.
Google wrote:
It's now easier than ever to find conversions changes to your account. Filter change history reports to view changes to conversions specifically, what was edited and who made the edits.
The help section describes that you can now track conversion actions such as steps taken to create, edit, or delete conversion actions.
This is a pretty small change but good for AdWords advertisers to know about.
Forum discussion at Google+.