Goodbye Ingress, Goodbye Sidecars: The Real Playbook for Moving to Kubernetes Gateway API

The Kubernetes networking stack has always lived with a strange tension. The earliest generations of ingress controllers were never designed for the scale, complexity, or multi-AZ traffic patterns we deal with today. And when service meshes arrived—Envoy sidecars everywhere, per-pod proxies, complex CRDs—the industry gained powerful features but paid for them with operational sweat, extra costs, and more moving parts than anyone really wanted to admit. Over time, teams started noticing the same problems repeat themselves: sidecars consuming more CPU than the actual business logic, cross-zone hops making latency unpredictable, complicated upgrades that broke at the worst possible moments, and observability pipelines that ballooned until simply scraping metrics became a project of its own. Add multi-cluster networking and AI workloads to the mix, and suddenly everything felt held together with duct tape. The dissatisfaction wasn’t theoretical. It was emotional. People were tired. And tha