code: func (client *Client) MetricsHandler(h http.Handler) http.Handler {
  	client.Config.Logger.Printf("DEPRECATION WARNING: honeybadger.MetricsHandler() has no effect and will be removed.")
  	if h == nil {
  		h = http.DefaultServeMux
  	}
  	fn := func(w http.ResponseWriter, r *http.Request) {
  		h.ServeHTTP(w, r)
  	}
  	return http.HandlerFunc(fn)
  }
docs: // MetricsHandler is deprecated.