sibility>A new model for Istio extensibility</h2><p>The model that replaces Mixer uses extensions in Envoy to provide even more
capability. The Istio community is leading the implementation of a
<a href=https://webassembly.org/>WebAssembly</a> (Wasm) runtime in Envoy, which lets us
implement extensions that are modular, sandboxed, and developed in one of
<a href=https://github.com/appcypher/awesome-wasm-langs>over 20 languages</a>. Extensions
can be dynamically loaded and reloaded while the proxy continues 