Dashboards are green – steady QPS, zero 5xx errors, ultra-low latency – yet users report AI hallucinations. Welcome to the silent nightmare of ANN search: recall degradation without infrastructure failure. How do you detect invisible failures? This session maps the four tiers of vector observability: DB internals, index health, LLM performance, and output quality. We’ll explore a production OSS stack (Percona for MongoDB, PMM, mongot, vLLM) and expose where open source still falls short.
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