Reel · Chaos & Reliability · Oct 13, 2026
Monitoring answers the questions you planned. Observability answers the ones you didn't.
In short
People use the two words as if they mean the same thing. They don't. Monitoring answers known questions (is CPU high, is the site up) with metrics and thresholds, and catches the failures you predicted. Observability answers new questions (why are only checkout calls slow in one region?) with metrics, logs and traces with rich context, and catches failures nobody predicted. You need both: monitoring is the smoke alarm, observability is the floor plan that shows you where the fire is.
Checklist: what to do about it
- List the questions your dashboards answer today. Those are your known questions.
- Page on symptoms users feel (SLO burn rate), not on causes like CPU at 90%.
- Add context to telemetry: request IDs, versions, regions, customer tier.
- Make sure you can slice by any field until the answer shows up, instead of staring at dashboards and guessing.
- Correlate metrics, logs and traces for the same request.
- After each incident, ask which question you couldn't answer, and instrument for it.