hard20 pts · first answer countsprometheuslatencyslis

Misleading histogram quantiles

Your latency SLO is "99% of requests under 300 ms". The histogram buckets are 0.1, 0.5, 1 and 5 seconds. Why is an alert on histogram_quantile(0.99, ...) > 0.3 unreliable?

A.histogram_quantile only works with summariesB.Quantiles cannot be computed for latencyC.The buckets must be in milliseconds, not secondsD.With no bucket at 0.3 s, the value is a linear guess between 0.1 and 0.5 s; add a bucket at the SLO threshold or alert on the bucket ratio

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Misleading histogram quantiles

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