docs: add beginner Aleph Alpha tracing example

[Bhavyansh19]

Hey, I added a beginner-friendly Aleph Alpha tracing example for #4069.

It covers:

• installing the instrumentation, Aleph Alpha client, and OpenTelemetry SDK
• setting the API token
• configuring a console span exporter
• instrumenting the Aleph Alpha client
• making a completion request and viewing the generated span

I also added the runnable example under packages/opentelemetry-instrumentation-alephalpha/examples/trace_completion.py and documented the same flow in the package README.

I ran the Python syntax check and git diff --check locally. The full uv checks were blocked because the environment could not download the uv-managed Python runtime.

Would appreciate a review. If everything looks good, feel free to merge it.

Closes #4069

Summary by CodeRabbit

• Documentation
  • Added a beginner-friendly guide to setting up and running an Aleph Alpha completion request with tracing, including an overview of the tracing steps and exported span.
• New Features
  • Added a runnable example that traces a completion request and prints the response. It uses the AA_TOKEN environment variable and the luminous-base model, and displays exported span details in the console.

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📝 Walkthrough

Walkthrough

Adds a runnable example that traces an Aleph Alpha completion request and prints its response. The README explains setup, execution, and the resulting span information.

Changes

Aleph Alpha tracing example

Layer / File(s)	Summary
Configure and run a traced completion packages/opentelemetry-instrumentation-alephalpha/examples/trace_completion.py, packages/opentelemetry-instrumentation-alephalpha/README.md	The example configures console span export, instruments the Aleph Alpha client, sends a completion request, and prints the first completion. The README describes setup, execution, and span information.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Sequence Diagram(s)

sequenceDiagram
  participant Example
  participant AlephAlphaInstrumentor
  participant AlephAlphaClient
  participant ConsoleSpanExporter
  Example->>AlephAlphaInstrumentor: Instrument client with tracer provider
  Example->>AlephAlphaClient: Submit completion request
  AlephAlphaClient->>ConsoleSpanExporter: Export completion span
  AlephAlphaClient-->>Example: Return completion

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Merge Risk: ⚪ Minimal · up to 9d8d8

The documented example and runnable script are aligned. No actionable issue remains before merge beyond normal checks.

Architecture Summary

Architecture risk: 🔵 Low · up to 05e34

The change affects 1 system.

Changed systems: packages/opentelemetry-instrumentation-alephalpha

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — packages/opentelemetry-instrumentation-alephalpha (library) was modified; 2 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in packages/opentelemetry-instrumentation-alephalpha/README.md: Added a beginner walkthrough that installs dependencies, configures a console span exporter and tracer provider, instruments the Aleph Alpha client, sends a completion request using AA_TOKEN, and prints the response. It also describes running the script and the resulting trace information.
• observed — Modified behavior in packages/opentelemetry-instrumentation-alephalpha/examples/trace_completion.py: Adds a runnable example that sets up tracing with console span export, instruments Aleph Alpha, submits a completion request, and prints the first completion.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a beginner Aleph Alpha tracing example to the documentation and runnable examples.
Linked Issues check	✅ Passed	The changes satisfy issue #4069. README.md gives a step-by-step setup with dependency installation, AA_TOKEN, tracer provider and console span exporter configuration, client instrumentation, and a…
Out of Scope Changes check	✅ Passed	The changes stay within issue #4069. The README documents the beginner tracing flow, and the example script implements that flow. No unrelated product or API changes are identified in the reviewed sco…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 …

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Inline comments:
Review comments at @packages/opentelemetry-instrumentation-alephalpha/README.md:
- Line 83: Update the terminal-output sentence in the README to state that the
OpenTelemetry span appears before the model response, matching the behavior of
SimpleSpanProcessor and client.complete().

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