Fix spacelift-promex readme

[eliecharra]

The readme for installing the promex exporter is slightly incorrect. Config values are prefixed with spacelift.

[eliecharra]

@Apollorion We should also suggest installing prom CRDs, since if you start from scratch, the cluster will not have them.

Can we add a dependency on this chart to install the CRDs without installing the whole prom stack?
https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack/charts/crds

[adamconnelly]

@Apollorion We should also suggest installing prom CRDs, since if you start from scratch, the cluster will not have them.

Can we add a dependency on this chart to install the CRDs without installing the whole prom stack? https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack/charts/crds

Personally I'm not sure that's a good idea. I think it might make more sense to make deploying the custom resources optional, and to explain in the README that there's a dependency on having a working Prometheus stack installed first. I'd be super wary of installing CRDs from some other project and ending up in a crazy dependency hell.

[Apollorion]

Ah, yeah, this is my fault. Thanks for the fix 👍

[Apollorion]

Also, I agree with @adamconnelly I do call out in the blog post I've written that kube prom stack is a requirement.

I can PR this repo too and make the callout in the readme as well later today.