Percentile (p95 / p99)
A percentile describes the value below which a given share of measurements fall: p95 latency is the response time that 95% of requests come in under.
Averages hide bad experiences; percentiles expose them. p95 and p99 reveal the slow tail that real users feel, which is why SLOs and performance targets are usually expressed as percentiles rather than means.
Related terms
LatencyLatency is the delay between sending a request and receiving a response, usually measured in milliseconds.Response TimeResponse time is how long a service takes to respond to a request, usually measured in milliseconds.SLI (Service Level Indicator)A Service Level Indicator (SLI) is the actual measured value of a reliability metric: the number you compare against your SLO and SLA.
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