Extracts the OTEL trace, metric, and log provider setup out of
`runServeCmd` and into `initOTELProviders` in a new `cmd/fleet/otel.go`.
Same pattern as the prior extractions on this issue (#44929, #45343,
#45583, #46166). Side effects (`otel.SetTracerProvider`,
`otel.SetMeterProvider`) are preserved inside the extracted function, so
runtime behavior is identical.
Three unit tests in `cmd/fleet/otel_test.go`:
- OTEL disabled (the common production path) returns `(nil, nil, nil)`
and never calls `initFatal`.
- OTEL enabled without log export returns non-nil trace and meter
providers; logger provider stays nil.
- Log export enabled returns all three providers non-nil.
One honest note on coverage: the four `initFatal` sites inside the
function are paranoid wrapping for OTEL SDK constructors that don't dial
at construction time, so the error paths are hard to drive in tests
without mocking the SDK. The tests above exercise the success paths and
the disabled gate, which is the bulk of the realistic flow.
This continues the path toward `serve.go` >60% coverage per the
discussion on #33370 — `serve.go` is now ~100 lines shorter and the OTEL
phase is testable as a unit. Remaining slices per the broader plan: MDM
Apple init, datastore init, Redis init.
**Related issue:** Refs #33370
# Checklist for submitter
- [x] Added/updated automated tests
- Changes file: not applicable — internal refactor with no user-visible
behavior change
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-->
## Summary by CodeRabbit
* **Refactor**
* Centralized OpenTelemetry provider initialization into a single setup
path, simplifying startup and shutdown behavior and making observability
configuration clearer.
* **Tests**
* Added unit tests covering disabled/enabled telemetry paths and
optional log export, plus cleanup logic to ensure providers are shut
down correctly.
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Rajendra kadam
06aba2c0d8
