<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#38607
Contributor docs update:
https://github.com/fleetdm/fleet/pull/39285/changes
Another contributor docs update:
https://github.com/fleetdm/fleet/pull/39402/changes
Also:
- renamed OtelHandler to OtelTracingHandler
- made "opentelemetry" be the default when tracing is enabled
- updated OTEL dependencies
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
## New Fleet configuration settings
- [x] Setting(s) is/are explicitly excluded from GitOps
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added OpenTelemetry log export capability, enabling logs to be sent to
OpenTelemetry collectors.
* New configuration option `logging.otel_logs_enabled` (requires tracing
to be enabled).
* **Chores**
* Updated OpenTelemetry dependencies to v1.40.0 with latest OTLP
exporters and logging support.
* Updated dependencies including gRPC (v1.78.0), Google libraries, and
cryptography packages.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#38889
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Structured logging with selectable JSON/text output and optional trace
correlation (trace_id, span_id).
* Backward-compatible output (ts timestamp, lowercase levels) and
adapter to interoperate with existing logging calls.
* **Refactor**
* Simplified logger initialization and centralized slog-based logging
infrastructure.
* **Tests**
* Extensive tests and a test handler for logging behavior, formats,
levels, and trace injection.
* **Chores**
* Added package-level dependency check for the logging package.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
