- In short
- Gradual quality drift is a slow decline in answer quality with no code change, often tracing to model drift, prompt drift, or retrieval and index drift as a corpus grows. Standard uptime dashboards can stay green throughout because they do not measure answer quality directly. The mitigation is a runbook entry naming "gradual decline, no code change" as a symptom that points at these causes, so a first-line engineer can act as it starts rather than waiting for a scheduled review.
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