When a unique user (or after 24 hours for same user?) clicks on a Discourse link, a tally is added to the end of the link. For example in the screenshot below, there is a tally of 102.
The issue is, whenever a post is merged into another thread, their link click count isn’t remembered. This is very trouble someone when a popular post needs a simple migration, but the poster loses all of their click score in the process.