Dock-plank photos still look like last year's training set, but what counts as must-replace this week changed after a new ordinance. A data-quality monitor stays green while business outcomes rot. What kind of drift is that?

Short Explanation

Dock-plank photos still look like last year, but what counts as must-replace changed after a new ordinance. That is concept drift: the target relationship changed. Green input histograms are covariate, not the target.

Full Explanation

Concept drift is a change in the target relationship. Input histograms can stay green (no covariate drift) while outcomes rot. Model-quality or a new label definition is the signal. Fraud Detector is not that diagnosis.

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