wrap produder config support customize trace option

[ThunderRussell]

Problem Statement

in my case, we support add some customize trace spanStartOption within producer: like this

type config struct {
	TracerProvider trace.TracerProvider
	Propagators    propagation.TextMapPropagator
	Tracer trace.Tracer
        SpanStartOptions []trace.SpanStartOption // add span start options
}

func startProducerSpan(cfg config, version sarama.KafkaVersion, msg *sarama.ProducerMessage) trace.Span {
	// If there's a span context in the message, use that as the parent context.
	carrier := NewProducerMessageCarrier(msg)
	ctx := cfg.Propagators.Extract(context.Background(), carrier)

	// Create a span.
	attrs := []attribute.KeyValue{
		semconv.MessagingSystem("kafka"),
		semconv.MessagingDestinationKindTopic,
		semconv.MessagingDestinationName(msg.Topic),
		semconv.MessagingMessagePayloadSizeBytes(msgPayloadSize(msg, version)),
		semconv.MessagingOperationPublish,
	}
        //  add users customize trace option
	opts :=append(cfg.SpanStartOptions , []trace.SpanStartOption{
		trace.WithAttributes(attrs...),
		trace.WithSpanKind(trace.SpanKindProducer),
	}...)
	ctx, span := cfg.Tracer.Start(ctx, fmt.Sprintf("%s publish", msg.Topic), opts...)

	if version.IsAtLeast(sarama.V0_11_0_0) {
		// Inject current span context, so consumers can use it to propagate span.
		cfg.Propagators.Inject(ctx, carrier)
	}

	return span
}

[dmathieu]

Hi,

Your question/requests is a bit unclear here. Could you try to explain a bit more what you're trying to achieve?

[ThunderRussell]

Hi,
in my case, our company apm topology depends trace span with specific attributes， such as<"mq.topic", "xxx">,
i hope support to set SpanStartOptions config while otelsarama.WrapAsyncProducer

[dmathieu]

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