- In short
- Retrieval precision and recall should be tracked as first-class system metrics, not inferred only from end-to-end output quality. Retrieval quality drifts when the index falls out of sync with the underlying documents, or when query patterns shift over time. A drop in end-to-end answer quality with stable retrieval metrics points to a generation-layer problem, not a retrieval-layer one, which is why the two must be measured separately.
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