[hotrod] Return trace ID via traceresponse header #4584
Merged
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Which problem is this PR solving?
Since the HotROD UI does not start traces, it can only search for a trace corresponding to a particular request by some span tags. This makes the experience of opening a trace a big clunky as we first see the search page with one trace, and then have to click on the trace again.
Related to #3380
Short description of the changes
Change the HTTP instrumentation to always generate a
traceresponse
header per the current W3C draft. Then parse the trace ID from that header in the UI and generate a hyperlink to open the trace view directly, bypassing the search.