rer.php?u=%2fv1.22%2fblog%2f2021%2fmigrate-alpha-policy%2f" target=_blank><img class=share-icon src=/v1.22/img/social/facebook.svg alt="Share to Facebook"></a></div></div><nav class=pagenav><div class=left><a title="An update on Envoy and Istio's WebAssembly-based extensibility effort." href=/v1.22/blog/2021/wasm-progress/ class=next-link><svg class="icon left-arrow"><use xlink:href="/v1.22/img/icons.svg#left-arrow"/></svg>Istio and Envoy WebAssembly Extensibility, One Year On</a></div><div class=right><a t