[log] Add debug logging to tracing/provider.go

[github-actions]

Adds 5 meaningful debug log calls to internal/tracing/provider.go using the existing logTracing logger (logger.New("tracing:provider")).

Changes

Location	Log added
Shutdown()	Logs before flushing/shutting down the OTLP SDK provider
registerPropagator()	Logs W3C TraceContext+Baggage propagator registration
InitProvider() — after exporter creation	Logs successful OTLP HTTP exporter creation
InitProvider() — sampler selection	Logs which sampler is chosen: AlwaysSample, NeverSample, or TraceIDRatioBased (with rate)

Why these spots?

• Shutdown — previously silent; useful to confirm the SDK provider is actually being flushed on exit vs the noop path.
• registerPropagator — called unconditionally on every InitProvider call (even when tracing is disabled); logging confirms the W3C propagator is registered so incoming traceparent headers are honoured.
• Exporter creation — the failure path was already logged; this adds the success path.
• Sampler selection — a three-branch switch with no visibility; helps diagnose unexpected sampling behaviour when sampleRate is near 0 or 1.

Validation

• make agent-finished ran: format ✓, build ✓, lint ✓, all Go tests ✓ (Rust tests skipped — network firewall blocks crates.io in this environment).

Warning

Firewall blocked 1 domain

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• index.crates.io

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "index.crates.io"

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Generated by Go Logger Enhancement · sonnet46 5M · ◷

[Copilot]

Pull request overview

This PR adds additional debug-level observability to the OpenTelemetry tracing provider initialization and shutdown path, using the existing logTracing debug logger (logger.New("tracing:provider")) to make tracer/provider state transitions easier to diagnose when DEBUG is enabled.

Changes:

• Log when the OTLP tracer provider is being flushed and shut down (non-noop path).
• Log global W3C TraceContext + Baggage propagator registration.
• Log successful OTLP HTTP exporter creation and which sampler branch was selected (including rate for ratio-based sampling).

Show a summary per file

File	Description
internal/tracing/provider.go	Adds 5 debug log calls around OTLP provider lifecycle, propagator registration, exporter creation, and sampler selection.

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• Comments generated: 0