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Your production model decayed. Is it data drift, concept drift, or a pipeline bug, and how do you tell them apart?

'The model got worse' has three very different causes and three different fixes. Retraining a model that's actually broken by a pipeline bug just bakes in garbage. Here is the triage order.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

'The model got worse' has three very different causes and three different fixes. Retraining a model that's actually broken by a pipeline bug just bakes in garbage. Here is the triage order.

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