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Stephan Behnke 7ab5df336c Trace outbound Nexus HTTP requests (#11559)
## What changed?
Instrumented local frontend, CHASM callback, and external Nexus
operation HTTP clients with the shared OpenTelemetry transport.

Legacy HSM callbacks and cross-cluster forwarding are intentionally out
of scope.

## Why?
Outbound Nexus HTTP calls need to carry trace context so callbacks and
internal frontend calls remain connected to their originating spans.

## How did you test it?
- [x] built
- [ ] run locally and tested manually
- [ ] covered by existing tests
- [ ] added new unit test(s)
- [x] added new functional test(s)

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
2026-08-19 10:09:51 -07:00
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