Matt Miller focused on enhancing documentation for the envoyproxy/gateway repository, specifically around integrating Open Policy Agent (OPA) as a sidecar with Envoy Gateway. He developed comprehensive guidance and an end-to-end example demonstrating how to configure OPA and Envoy to communicate over Unix Domain Sockets, addressing both performance and security considerations. Using Markdown and YAML, Matt clarified configuration steps to help operators avoid common misconfigurations, improving onboarding for Kubernetes deployments. While he did not contribute runtime code changes, his work provided depth by addressing real-world pitfalls and offering practical, security-conscious documentation for policy enforcement in cloud-native environments.