Airbnb has successfully implemented seamless upgrades of Istio across tens of thousands of pods and numerous Kubernetes clusters by utilizing a canary upgrade model and a custom mutation framework named Krispr. This approach allows independent workload upgrades with zero downtime, gradual rollouts, and the ability to revert changes without requiring coordination among diverse teams. The article details the architecture and processes that enable these upgrades for both Kubernetes and virtual machine environments.

Envoy Gateway can be integrated with Istio's Ambient Mesh to enhance traffic management and policy enforcement through its advanced Layer 7 capabilities, despite Ambient Mesh's limitations. By deploying Envoy Gateway as both the Ingress Gateway and Waypoint Proxy, users can simplify configurations while leveraging powerful features like global rate limiting and enhanced security policies. The article provides a step-by-step guide on setting up Envoy Gateway within an Ambient Mesh environment.