Since istio 1.5, mixer has been deprecated, and also the adapter programming model is also gone.
Hi
AFAIK Now use Wasm to extend the envoy proxy. i share some links so you get idea about that.
https://docs.google.com/document/d/1x5XeKWRdpFPAy7JYxiTz5u-Ux2eoBQ80lXT6XYjvUuQ/edit#heading=h.qex63c29z2to
May this will help you.
great! thank you!
No.
you need to follow this process to get access to the design documentation:
# Contributing to Istio
So, you want to hack on Istio? Yay!
The following sections outline the process all changes to the Istio
repositories go through. All changes, regardless of whether they are from
newcomers to the community or from the core team follow the
same process and are given the same level of review.
- [Working groups](#working-groups)
- [Code of conduct](#code-of-conduct)
- [Team values](#team-values)
- [Contributor license agreements](#contributor-license-agreements)
- [Design documents](#design-documents)
- [Contributing a feature](#contributing-a-feature)
- [Setting up to contribute to Istio](#setting-up-to-contribute-to-istio)
- [Pull requests](#pull-requests)
- [Issues](#issues)
You can find additional contributor material on the [Istio Wiki](https://github.com/istio/istio/wiki)
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