Why Observability Is Not the Same as Monitoring

Monitoring tells you when known problems fire. Observability lets you ask new questions.

[ essay ]

Dashboards of golden signals catch regressions you anticipated. They fail on novel failures — the bug you never instrumented.

Observability requires high-cardinality logs, exemplars, trace context, and ad-hoc query ability.

Build for questions: show checkout latency for EU users on mobile when flag X is on.

Monitoring is insurance on known risks. Observability is exploration budget for unknown ones.

Ship both; confuse neither.

— JV · Dark Heart Labs.