Diagnose sudden latency spikes by separating tail behavior from the average and tracing the spike to its source.
## CONTEXT Average latency hides the truth; users feel the tail. A service can have a healthy mean while a small fraction of requests take seconds, and that tail is what causes timeouts, retries, and cascading failures. Diagnosing latency spikes means looking at percentiles rather than averages, then asking what the…
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