Officically Document proxy_url support

[metzgertie]

The documentation for the agent is currently out of date and does not mention the support for proxy_url. You'll need to search the supported prometheus drop-in options or the link pointing at it.

https://community.grafana.com/t/grafana-agent-behind-network-firewall-cant-specify-proxy/65044

[rfratto]

Hi, thanks for the report.

Unfortunately it's unclear where proxy_url is supported. Our docs for metrics_config link out to Prometheus for remote_write, which is where the proxy_url field is defined.

This is something we've struggled with historically and are trying to find a good middle ground for: if we're directly exposing Prometheus fields to users, duplicating information is risky because you can become out of date. On the other hand, linking out to information can make it become unclear what is actually supported.

We'll spend some time thinking about what to do about this and improve our documentation.

[metzgertie]

@rfratto Thanks for the answer. I just noticed it because I suddendly needed to setup a agent in a third-party environment with a custom proxy. I'd like to see a clarified stance on proxy support in the agent.

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