Drift is the gap between what the tracker says and what the code shows. Every row below is a disagreement GroundTruth found by reading source control and comparing it to the ticket.

Each finding carries a confidence. That number is not drift and it is not a quality score: it is how certain the check is about this one judgment. A finding above the threshold can be applied automatically. Below it, nothing is written and the finding goes to a person with the criterion and the diff side by side, because a wrong write costs more than a slow one.

The common cases are a ticket in Done with nothing merged behind it, work that merged against no ticket at all, and a ticket whose acceptance criteria are not met by the code that closed it.