has offered several APIs for extensibility since launch, and none of them has been able to mature to Stable. Of those in use today, Envoy Filters are a powerful tool for tweaking internal proxy configuration, and modifying traffic flow, but are very difficult to use, and pose significant risk during upgrades, which can change the filter integrations in ways that cannot always be predicted. WebAssembly (Wasm) emerged in 2019 as a powerful tool for Turing-complete modification of traffic, but community suppor