When adding a label, the Span does not get sent

Description When I add an entry to the Labels field inside the Span, then the whole span is not sent.

To Reproduce I have the following code that wraps creating a span and adding a label:

    public class LogPerformance : ILogPerformance
    {
        public T CaptureSpan<T>(Func<T> func)
        {
            return Elastic.Apm.Agent.Tracer.CurrentTransaction.CaptureSpan(
                "spanName",
                "spanType",
                span =>
                {
                    span.Labels["foo"] = "bar";

                    return func();
                },
                "spanSubType");
        }

I expect to see the Span arrive in Kibana with that label, but it never arrives. If I remove span.Labels["foo"] = "bar";, then there is no problem and it arrives.

No obvious exception or error message is observed.

[SteveDunn]

I think so @gregkalapos . Thank you very much for your help. We’ll be in touch if there are any related issues that we discover.

Regards,

Steve

[gregkalapos]

@fenneh thanks for the update - sounds good.

I can’t give you any explanation on how it’s come about, but your explanation sounds reasonable.

Let me know if you managed to fix the issue.

From the agent’s point of view I’d say there is nothing to do, but if you need help we can transfer the issue to the APM Server team.