Can prometeus-proxy be used to proxy metrics from an external source?

[joedborg]

Here's an example. I'm trying to use Flagger within my K8s cluster to get progressive rollouts. It can integrate with Istio to grab metrics from it via Prometheus. However, unless defining a bunch of custom metrics (instead of the built in ones) it seems to not be able to handle a source needing a secret access (fluxcd/flagger#1671).

I'd like to have a proxy inside the cluster, without needing auth, that proxies to my external Prometheus, using a secret. Thus, Flagger can just talk to the proxy, without needing the secret.

Is this possible with prometheus-proxy?

[pambrose]

Hey Joe,
I do not understand exactly what you want to do, but it sounds like something that should work. Have you tried it, and if so, what was the roadblock?