How to extract metrics when not using envoy?

[shreemaan-abhishek]

I'm using coraza-proxy-wasm as a plugin for APISIX: https://docs.api7.ai/apisix/how-to-guide/security/waf/integrate-with-coraza.

How do I get it to expose the metrics?
Does this require a PR?

I found some hints but no clarity. It seems only envoy is supported for now.

coraza-proxy-wasm/wasmplugin/metrics.go

Lines 40 to 42 in 51ef05a

	// This metric is processed as: waf_filter_tx_interruption{phase="http_request_body",rule_id="100",identifier="foo"}.
	// The extraction rule is defined in envoy.yaml as a bootstrap configuration.
	// See https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/metrics/v3/stats.proto#config-metrics-v3-statsconfig.

coraza-proxy-wasm/README.md

Line 209 in 51ef05a

Metrics are exposed in the prometheus format under `localhost:8082` (admin cluster in the envoy config).