Beyond Success‑Ratio: How User‑Uptime Reveals Real Product Availability

The article reviews traditional availability metrics such as Success‑Ratio, Error‑Budget, MTTR/MTTF, SLA/SLO, and highlights their limitations, then introduces Google’s User‑Uptime and Windowed User‑Uptime metrics, explains their definitions, challenges, experimental results, and why they provide a more user‑centric view of service reliability.

AvailabilityMetricsSRE

0 likes · 27 min read

Beyond Success‑Ratio: How User‑Uptime Reveals Real Product Availability

NetEase Yanxuan Technology Product Team

Nov 14, 2022 · Operations

Quantifying Internet Service Availability: Classic Metrics and the New User‑Uptime Indicator

The article reviews classic availability metrics such as Success‑Ratio, Incident‑Ratio, MTTR/MTTF, Error‑Budget, and SLA/SLO, then introduces User‑Uptime—a per‑user success time proportion that ignores long idle periods—and its windowed variant, showing how it complements existing indicators for more user‑centric reliability insight.

AvailabilityReliabilitySRE

0 likes · 27 min read

Quantifying Internet Service Availability: Classic Metrics and the New User‑Uptime Indicator