OpenTelemetry

The core module takes no OpenTelemetry dependency. WithMeter and WithTracer accept tiny internal interfaces (mamori.Meter, mamori.Tracer); the github.com/xavidop/mamori/x/otel module (package mamoriotel) bridges them to real OTel instruments.

go get github.com/xavidop/mamori/x/otel

Wiring it up

import (
	"go.opentelemetry.io/otel"
	mamoriotel "github.com/xavidop/mamori/x/otel"

	"github.com/xavidop/mamori"
)

func main() {
	meter, err := mamoriotel.NewMeter(otel.Meter("mamori"))
	if err != nil {
		log.Fatal(err)
	}
	tracer := mamoriotel.NewTracer(otel.Tracer("mamori"))

	w, err := mamori.Watch[Config](ctx,
		mamori.WithMeter(meter),
		mamori.WithTracer(tracer),
	)
	// ...
}

What it records

Instrument	Type	Attributes
`mamori.resolve.duration`	histogram (ms)	`scheme`, `status` (ok / error)
`mamori.refresh.count`	counter	`scheme`
`mamori.watch.errors`	counter	`scheme`

Plus a mamori.resolve span per resolve, with attributes mamori.scheme and mamori.ref; the span status is set to error (and the error recorded) when a resolve fails.

Because the bridge only implements the small mamori.Meter / mamori.Tracer interfaces, you can also write your own sink (to Prometheus, statsd, or a test recorder) without pulling in OpenTelemetry at all.