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

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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.

{{< idea >}} Istio 1.0 introduces 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 Adapter Dev Guide and the Out of Process Adapter Walk-through. {{< /idea >}}