Thanks for the verification @JonathanTron !
The selector is wrong, so it will not return something.
You are correct. In our core, we have the distributed versions of Warp10. When you are using another protocol, we are translating the queries into Warp10 format.
As PromQL support is in preview, we are always improving translation to WarpScript. I'm currently digging into our code to see what went wrong.
This is one possibility, I am checking it right now. I need to check how Prometheus is behaving in this case.