This module enables prometheus metrics for Caddy.
In your Caddyfile:
prometheus
For each virtual host that you want to see metrics for.
It optionally takes an address where the metrics are exported, the default
is localhost:9180. The metrics path is fixed to /metrics.
With caddyext you'll need to put this module early in the chain, so that
the duration histogram actually makes sense. I've put it at number 0.
The following metrics are exported:
- caddy_http_request_count_total{host, family, proto}
- caddy_http_request_duration_seconds{host, family, proto}
- caddy_http_response_size_bytes{host}
- caddy_http_response_status_count_total{host, status}
Each counter has a label host which is the hostname used for the request/response.
The status_count metrics has an extra label status which holds the status code.
The request_count_total and request_duration_seconds also has the protocol family in the
family label, this is either 1 (IP version 4) or 2 (IP version 6) and the HTTP protocol major and
minor version (in the proto label) used: 1.x or 2 signifying HTTP/1.x or HTTP/2.