Tracing: change baggage key to be lower kebab-case for Jaeger compatability #4018
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Signed-off-by: Conor Evans coevans@tcd.ie
Closes #3951
Changes
Make baggage key lowercase for Jaeger support. Per Jaeger documentation:
Verification
Since this is a one-line const change, no tests have been added. I also did not feel terribly inclined to spin up a local Thanos+Jaeger set-up, though I can do so for completeness if desired.