code>gauge</code>, and <code>histogram</code>). The <code>metrics</code> section
provides values for the metric dimensions as expressions, and allows you to
remove or override the existing metric dimensions. You can modify the standard
metric definitions using <code>tags_to_remove</code> or by re-defining a dimension.</p><p>For more information, see <a href=/v1.6/docs/reference/config/proxy_extensions/stats/>Stats Config reference</a>.</p><h2 id=before-you-begin>Before you begin</h2><p><a href=/v1.6/docs/se