[BUG]: 'baggage' header overriden in http requests

[csolidum-persona]

Tracer Version(s)

2.17.0

Ruby Version(s)

ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux]

Relevent Library and Version(s)

No response

Bug Report

The datadog tracing gem doesn't respect existing items in the baggage http header. According to the baggage spec , multiple baggage headers should be merged instead of being overwritten.

Reproduction Code

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Configuration Block

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Error Logs

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Operating System

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How does Datadog help you?

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