title: Unexplainable "root" uri in spring boot prometheus metrics
body: <p>In our Prometheus metrics in our Spring Boot API, there is a very mysterious <em>root</em> "endpoint" that appears to be called sometimes. This <em>looks</em> like someone probing our API, but the endpoint does not exist. The really strange part is that I don't see how this "URI" can even be called, since it doesn't start with a forward slash (<code>/</code>) ? We also see this request in our pod logs, but not in our ingress-controller logs. Where could it come from?
  <a href="https://i.stack.imgur.com/rDzPm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rDzPm.png" alt="&quot;root&quot; - status 403"></a></p>