title: Which permissions are needed to fetch metrics from arango?
body: <p>I want to fetch arangodb metrics with prometheus.
  Since I enabled authertication this has to be done with an user and password.</p>
  <p>What are the required permissions needed for this?</p>
  <p>This works so far:</p>
  <pre><code>arangosh
  const users = require('@arangodb/users');
  users.save('prometheus', 'supersecure')
  users.grantDatabase(&quot;prometheus&quot;, &quot;_system&quot;, &quot;ro&quot;)
  users.grantCollection(&quot;prometheus&quot;, &quot;_system&quot;, &quot;*&quot;, &quot;none&quot;)
  </code></pre>