Test Measure Iterate - Balancing “Good Enough” & “Perfect”
summary
Critical-path DNS services require moving fast without large failures, so iterate in small, real-world releases to shrink failure scope and find bugs early. Use gradual rollouts, functional + integration tests, CI/CD pipelines, narrow KPIs and alerting to make releases cheap and observable. Prioritize investment where the product of cost of failure × change velocity is highest (e.g., DNS control plane), and note the team rebuilt their DNS server from scratch to apply these practices.
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