- In short
- An overall accuracy or outcome metric can look healthy while harm concentrates in a specific subgroup that a per-decision log or subgroup breakdown would reveal. An aggregate dashboard with no per-subgroup view hides unequal outcomes concentrated in one group, and a routing step or retrieval skew that is not logged individually can go undetected even when overall metrics look acceptable. Detecting subgroup harm requires deliberately instrumenting for it, not just monitoring an overall success rate.
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