How can I setup /metrics handler to expose the default metrics collected by ogen server?

[zwpaper]

I noticed there is an example with otel support, https://github.com/ogen-go/example, but it seems to be complicated, and depends on https://github.com/go-faster/sdk, I just want to expose the metrics collected by ogen server by default

[tdakkota]

You can create a Prometheus MeterProvider by yourself:

exporter, err := prometheus.New()
if err != nil {
	return err
}
provider := metric.NewMeterProvider(metric.WithReader(exporter))

srv, err := <api_package>.NewServer(<api_package>.WithMeterProvider(provider))
if err != nil {
	return err
}

http.Handle("/metrics", promhttp.Handler())
http.Handle("/api", http.StripPrefix("/api", srv))
http.ListenAndServe(":8080", nil)

There is OpenTelemery SDK example.

[zwpaper]

http.Handle("/api", http.StripPrefix("/api", srv)) should be like:

http.Handle("/api/", http.StripPrefix("/api", srv))

to catch all the /api/ routes