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Are p99 measurements helpful for monitoring of app performance?
A p99 metric indicates that 99% of requests are completed within a preset latency. But debate around ScyllaDB's upcoming P99 virtual conference (Oct. 18-19) shows concerns about the metric.
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Yes. It is a simple, effective tool to find trouble spots.
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Somewhat, but p99 does not track things that make users mad, such as timeouts, retries, failed queries.
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Not very helpful. Its value for end user monitoring is limited since most never experience 99 percentile-level performance anyway.
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Hell no. Reliance on p99 obscures the possibility that one slow operation can cause a ripple effect of other delays, and gets obscured in the noise.
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Cowboy Neal.
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