s/>Stats Config reference</a>.</p><h2 id=before-you-begin>Before you begin</h2><p><a href=/v1.16/docs/setup/>Install Istio</a> in your cluster and deploy an application.
Alternatively, you can set up custom statistics as part of the Istio
installation.</p><p>The <a href=/v1.16/docs/examples/bookinfo/>Bookinfo</a> sample application is used as
the example application throughout this task.</p><h2 id=enable-custom-metrics>Enable custom metrics</h2><ol><li><p>The default telemetry v2 <code>EnvoyFilter</code> co