docs: @Bean Reporter<Span> reporter(
        Sender sender,
        @Value("${zipkin.self-tracing.message-timeout:1}") int messageTimeout,
        CollectorMetrics metrics) {
      return AsyncReporter.builder(sender)
          .messageTimeout(messageTimeout, TimeUnit.SECONDS)
          .metrics(new ReporterMetricsAdapter(metrics.forTransport("local")))
          .build();
    }