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The four golden signals — Google SRE.

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Answer

  • (1) Latency: time to serve request (p50, p99).
  • (2) Traffic: requests per second.
  • (3) Errors: rate of failed requests.
  • (4) Saturation: how full resource is (CPU / memory / disk / GPU).
  • Original SRE book.
  • For ML add: (5) prediction quality / accuracy.
  • (6) drift score.
  • Together = comprehensive service health.
  • Standard entry-point for observability dashboards.
  • Every service should have all four.
Check yourself — multiple choice
  • Random
  • Latency (p50/p99) + Traffic (RPS) + Errors (fail rate) + Saturation (CPU/mem/GPU) — Google SRE; ML adds accuracy + drift; every service dashboard
  • Just latency
  • Not real

Golden signals: Latency + Traffic + Errors + Saturation + (ML: accuracy + drift).

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