istio.io/content/help/faq/mixer/writing-custom-adapters.md

title	weight
How can I write a custom adapter for Mixer?	40

Learn how to implement a new adapter for Mixer by consulting the Adapter Developer's Guide.

NOTE: For Istio 1.0, Mixer has introduced initial support for out-of-process adapters. This will be the recommended approach moving forward for integrating with Mixer. Initial documentation on how to build an out-of-process adapter is provided by the Out Of Process gRPC Adapter Dev Guide and the gRPC Adapter Walkthrough.