Announcing Gateway API support for App Routing

As of AKS release v20260428 (April 28, 2026), both managed Gateway API (--enable-gateway-api) and the app routing Istio Gateway API implementation (--enable-app-routing-istio) are generally available on AKS.
You no longer need preview feature flags or the aks-preview extension; the steps later in this post reflect the original preview experience.
We're announcing preview support for the Kubernetes Gateway API in the AKS application routing add-on. This brings a modern, role-oriented traffic management model to AKS — and establishes a clear migration path ahead of the upcoming Ingress-NGINX retirement.

