s/releases/1.8.x/announcing-1.8/#deprecations>removed in the 1.8 Istio release</a>.
Migration is needed if you still rely on Mixer&rsquo;s built-in adapters or any out-of-process adapters for mesh extension.</p><p>For built-in adapters, several alternatives are provided:</p><ul><li><code>Prometheus</code> and <code>Stackdriver</code> integrations are implemented as <a href=/v1.17/docs/reference/config/proxy_extensions/>proxy extensions</a>.
Customization of telemetry generated by these two extensions can be