section><p>A Rule is a selector and a set of intentions to be executed when the
selector is <code>true</code></p><p>The following example instructs Mixer to invoke <code>prometheus-handler</code> handler for all services and pass it the
instance constructed using the &lsquo;RequestCountByService&rsquo; instance.</p><pre><code class=language-yaml>- match: match(destination.service.host, &quot;*&quot;)
  actions:
  - handler: prometheus-handler
    instances:
    - RequestCountByService
</code></pre><table cl