func Initialize() (func(), error) {
	exp, err := newExporter()
	if err != nil {
		return nil, err
	}
	tp := trace.NewTracerProvider(
		trace.WithBatcher(exp),
		trace.WithResource(newResource()),
	)
	otel.SetTracerProvider(tp)
	return func() {
		if err := tp.Shutdown(context.Background()); err != nil {
			log.Warnf("failed to shutdown tracing: %v", err)
		}
	}, nil
}