We can possibly use the search parameters and see if things are going well:

- [views:5000 closed:1 "possible duplicate" answers:1](https://askubuntu.com/search?q=views%3A5000+closed%3A1+%22possible+duplicate%22+answers%3A1)

The data is pretty live and will look for questions that are closed as duplicates and have more than 5000 views. You can tweak the page view count and find the questions as you see is relevant.