Caddyfile metrics labelling

LukasDice · November 6, 2020, 7:20pm

I am wondering whether it is possible to somehow label metrics from different directives in a Caddyfile. Say for example I have the following Caddyfile and want to monitor, say, caddy_http_requests_total

:2020 {
    metrics
}

www.mydomain.com {
    reverse_proxy service:port
}

subdomain1.mydomain.com {
    reverse_proxy service:port
}

subdomain2.mydomain.com {
    reverse_proxy service:port
}

My question is whether there is a way to differentiate the metrics for each of the reverse_proxy directives such that I can read metrics for each of them separately. With the Caddyfile config adaptor they are all bunded under the srv0 server, so I can’t differentiate them in that way.

Now I know this would be possible to achieve when writing the config in JSON, because there you can create multiple servers and name them arbitrarily. I would like to know whether there is or will be a way to achieve this in the Caddyfile. Just being curious

francislavoie · November 6, 2020, 7:24pm

Metrics is a pretty fresh feature, so that isn’t covered yet. But there’s discussion in this github issue about it:

github.com/caddyserver/caddy

Support per-host Prometheus metrics

opened 03:03PM - 08 Oct 20 UTC

muety

feature discussion

Initiated through [this](https://caddy.community/t/per-host-prometheus-metrics/1…0035) forum post – involving @hairyhenderson –, I'd like to open the discussion about extending the `metrics` directive to support metrics (request count, etc.) on a per-host basis. I'd like to have metrics exposed for every single site block (speaking in Caddyfile terminology), i.e. metrics about different sites / vhosts result in different Prometheus metrics labels. Since determining the labels automatically based on the incoming requests' host headers is problematic (see discussion above), a solution would be to manually assign a tag to the `metrics` directive. For instance: ``` example.org { root /var/www/html file_server metrics /metrics { host "example.org" } } ``` I'm not really involved with Caddy's code base or development process, so this is rather supposed to be a starter for further discussion.

LukasDice · November 6, 2020, 7:30pm

Alright, nice it has been logged already, I’ll definitely follow that topic. And for anyone reading this there was already a topic on this here which I missed initially.

system · December 6, 2020, 7:21pm

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