ion</h2><p>While Istio 1.3 focuses on usability, expert users can use advanced features in Envoy that are not part of the Istio Networking APIs. We enhanced the <code>EnvoyFilter</code> API to allow users to fully customize:</p><ul><li>The HTTP/TCP listeners and their filter chains returned by LDS</li><li>The Envoy HTTP route configuration returned by the RDS</li><li>The set of clusters returned by CDS</li></ul><p>You get the best of both worlds:</p><p>Leverage Istio to integrate with Kubernetes and handle 