What cannot be observed cannot be understood.
Instrumentation makes runtime behavior available to engineering judgment.
Interpretation
Source code describes intended paths; observability shows which paths real systems take, at what cost, and for whom. Instrument meaningful boundaries with context that links events across services. The goal is not more data, but enough evidence to ask new questions during an unfamiliar failure.
Practice
- Instrument service boundaries and critical user journeys.
- Carry correlation identifiers across asynchronous work.
- Review telemetry while designing the change.
Anti-pattern
Adding logs only after an incident makes the missing context obvious.