Improve logging when multiple traceheaders detected

[kyrielia]

Is your feature request related to a problem? Please describe.

In 8.10.0, this log line was introduced into the newrelic-agent:
https://github.com/newrelic/newrelic-java-agent/blob/main/newrelic-agent/src/main/java/com/newrelic/agent/tracing/W3CTraceParentParser.java#L25

We have a microservice that has been updated to the latest version of NR agent, where we are now seeing this warning pollute our logs. My impression is that we have always had this multiple traceparent issue, but before it was invisible.

However the log line in its current form is unhelpful. It tells you that there is a problem with multiple traceparents, but the agent does not log anything else to help you triage and locate the source of the traceparents.

Feature Description

It would be useful if:

• This log line included the list of traceparents.
• There was easier/better logging to help triage whether a traceparent came from an API request, or was inserted by the agent. At the moment, I'm finding it very difficult to prove one or the other.

Describe Alternatives

Have tried to search the traceparent in New Relic dashboard, but wasn't able to locate it.

Additional context

Add any other context here.

Priority

Really Want

[workato-integration]

https://new-relic.atlassian.net/browse/NR-336365