Add support for --web.route-prefix

[sushovan23]

I have deployed promxy in k8s using helm chart. exposing it using nginx ingress controller however I want to access it using endpoint like /promxy-prod instead of just /
If there any configuration available to set httpprefix path?

[sushovan23]

may be something similar to what prometheus provides with --web.route-prefix

[jacksontj]

Thanks for the question! As of today the only mechanism supported as of now is to use the externalUrl -- but it seems that upstream has since added a --web.route-prefix as well, so we could add that to promxy to match.

But if you need something now using externalUrl will do the trick (thats what I've been using).

I've renamed this issue to be a feature request for that flag -- which should be a simple change to make.