stance &lsquo;RequestCountByService&rsquo;.</p><pre><code class=language-yaml>  handler: prometheus-handler
  instances:
  - RequestCountByService
</code></pre><table class=message-fields><thead><tr><th>Field</th><th>Type</th><th>Description</th></tr></thead><tbody><tr id=Action-handler><td><code>handler</code></td><td><code>string</code></td><td><p>Required. Fully qualified name of the handler to invoke.
Must match the <code>name</code> of a <a href=#Handler-name>Handler</a>.</p></td></tr><tr id=Action-ins