Unexplainable "root" uri in spring boot prometheus metrics

Question

In our Prometheus metrics in our Spring Boot API, there is a very mysterious root "endpoint" that appears to be called sometimes. This looks 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 (/) ? We also see this request in our pod logs, but not in our ingress-controller logs. Where could it come from?

Answer 1

I ran into the same issue with a lot of head scratching. It turns out in my case, @Timing annotations were attached to all of my rest controllers which quietly overrode the default http metrics provided from actuator.