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org.springframework.kafka.KafkaListenerEndpointContainer#0-4-C-1 InstMethodsInter : class[class org.postgresql.jdbc.PgPreparedStatement] before method[executeWithFlags] intercept fai

This might be flaky behavior as well, I haven't seen this one before. It failed master build.

https://travis-ci.org/github/jaegertracing/jaeger/jobs/735758903

=== RUN   TestTBufferedServer_SendReceive
==================
WARNING: DATA RACE
Write at 0x00c000074850 by goroutine 9:
  runtime.closechan()
      /home/travis/.gimme/versions/go1.15.2.linux.amd64/src/runtime/chan.go:352 +0x0

This coverage change came up in a PR #530 that did not touch the source code at all

It is likely that there is a race condition that makes this line not being executing in some cases. Need to make it more deterministic.

See:
open-telemetry/opentelemetry-specification#1075

According to the spec, null attribute values are invalid/undefined behavior. This should be documented.

Update the spec compliance matrix upon completion.

@thegryfon noticed that in community axios implementations, some leak contexts and you wouldn't necessarily know until a second root trace is attempted.

here's an example scenario I think tests could cover:

there is no parent trace in scope
create a client request
create a second client request
verify that both client requests are root spans

See: #1482

Cannot use same trace ID accross different node of microservices

On the document of https://opentracing.io/docs/overview/tracers/#propagating-a-trace-with-inject-extract, there is a concept of inject and extract. This is working fine with http carrier. Yet, I cannot reproduce this with Text Map carrier.

Please create a doc for u