Test in Prod With Canary Everything
summary
Claims migration from expensive, inconsistent non-prod stacks to testing in production using GitOps-driven deployments and a cellular architecture. Builds an Istio + custom Envoy filter that implements account-based canary routing so specific user accounts hit new code paths while others stay on stable release. Shows how the setup captures real-user errors and latency, integrates with observability, and lets teams validate features in prod before full rollout, reducing wasted non-prod environments.
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