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TestingSeptember 2025
Testing in production: safe techniques that add confidence
Controlled production tests validate assumptions that are impossible to replicate elsewhere - do them safely and minimally.
Canary and shadowing
Run canaries that exercise a small percentage of real traffic and shadow traffic for validation without user impact.
Use feature flags and gradual rollouts to minimise blast radius.
Safety first
Always have kill switches, monitor key metrics, and predefine success criteria before any production experiment.
Document experiments and ensure they are observable from end-to-end.