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Debug a p99 Latency Regression After a Deploy is a medium troubleshooting interview question covering troubleshooting, latency debugging, tail latency, saturation, monitoring and alerting — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
p99 latency on your API tripled shortly after this morning's deploy. p50 is exactly where it was yesterday. No customer has complained yet. The deploy contained a feature change and a routine dependency bump. Decide what the flat median tells you, and how you would find the cause.
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