The four golden signals — Google SRE.
easyAnswer
- (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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