feat(groq): capture reasoning content and reasoning tokens

[HarianthK]

What

Groq's reasoning models (qwen/qwen3-32b, openai/gpt-oss-*, deepseek-r1-distill-*) return their thinking beside the answer when the request sets reasoning_format="parsed": message.reasoning on a completion, delta.reasoning on each streamed chunk, and usage.completion_tokens_details.reasoning_tokens for the count. The groq SDK has carried all three since 0.9 (ChatCompletionMessage.reasoning, ChoiceDelta.reasoning, CompletionTokensDetails.reasoning_tokens, all present in the 1.2.0 this package pins). The instrumentor read none of them: the span showed the answer with no reasoning part, and the completion token count with no reasoning breakdown. The OpenAI instrumentor in this repo already records both ({"type": "reasoning"} part and gen_ai.usage.reasoning_tokens), so this brings Groq in line with it.

Fix

• set_response_attributes: a {"type": "reasoning", "content": ...} part is appended after the text part when message.reasoning is set, the same order the OpenAI instrumentor uses for reasoning_content.
• set_model_response_attributes and set_model_streaming_response_attributes: gen_ai.usage.reasoning_tokens is set from completion_tokens_details.reasoning_tokens when the API reports it, next to the existing cached_tokens handling.
• Streaming: _process_streaming_chunk also returns the chunk's delta.reasoning, both stream processors accumulate it beside the content, and set_streaming_response_attributes records the same part. The three existing tests that unpack the tuple are updated for the extra field.

Responses without reasoning are unchanged: no part, no attribute.

Tests

tests/traces/test_reasoning.py runs the real Groq client over an httpx.MockTransport that serves a parsed-reasoning completion and the equivalent SSE stream, so there is no key and no cassette. The non-streaming and streaming tests both fail on main (the output messages have only the text part), and a third pins the no-reasoning response as unchanged. uv run pytest tests/ passes, 128 tests; ruff check is clean.

• I have added tests that cover my changes.
• If adding a new instrumentation or changing an existing one, I've added screenshots from some observability platform showing the change. (No platform at hand; the test asserts the recorded parts and attribute, and I can add a screenshot if you want one.)
• PR name follows conventional commits format: feat(instrumentation): ... or fix(instrumentation): ....
• (If applicable) I have updated the documentation accordingly. (Nothing to change.)

Summary by CodeRabbit

• New Features

  • Added support for capturing reasoning text from Groq reasoning models in both streaming and non-streaming responses.
  • Reasoning content is recorded in output message attributes.
  • Added tracking for tokens used during reasoning when reported by the model.
  • Streaming responses now preserve reasoning content across response chunks.

• Tests

  • Added coverage for reasoning-enabled, streaming, non-streaming, and reasoning-free completions.

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📝 Walkthrough

Walkthrough

Groq instrumentation now captures reasoning text from streamed and non-streamed completions. It records reasoning output parts and reasoning-token usage attributes. Tests cover split streaming reasoning, non-streaming reasoning, and completions without reasoning.

Changes

Groq reasoning telemetry

Layer / File(s)	Summary
Streaming reasoning propagation packages/opentelemetry-instrumentation-groq/opentelemetry/instrumentation/groq/__init__.py, packages/opentelemetry-instrumentation-groq/opentelemetry/instrumentation/groq/span_utils.py, packages/opentelemetry-instrumentation-groq/tests/traces/test_init.py	Streaming chunk processing returns reasoning fragments. Sync and async processors accumulate the fragments and pass them to span attribute handling.
Response reasoning and token usage packages/opentelemetry-instrumentation-groq/opentelemetry/instrumentation/groq/span_utils.py, packages/opentelemetry-instrumentation-groq/tests/traces/test_reasoning.py	Response helpers add reasoning parts and record GEN_AI_USAGE_REASONING_TOKENS when the completion provides reasoning data. Tests cover streamed, non-streamed, and reasoning-free completions.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant GroqStream
  participant _process_streaming_chunk
  participant set_streaming_response_attributes
  GroqStream->>_process_streaming_chunk: provide delta.reasoning
  _process_streaming_chunk->>GroqStream: return reasoning fragments
  GroqStream->>set_streaming_response_attributes: provide accumulated_reasoning
  set_streaming_response_attributes->>GroqStream: record reasoning output part

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Merge Risk: 🟡 Moderate · up to 0f4f4

Streaming requests configured to emit events lose captured reasoning telemetry. Preserve reasoning through the event emitter and schema before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 21.74% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 23 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 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 Groq reasoning content and reasoning-token capture.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In
`@packages/opentelemetry-instrumentation-groq/opentelemetry/instrumentation/groq/__init__.py`:
- Around line 191-192: Update _handle_streaming_response to pass
accumulated_reasoning into emit_streaming_response_events, then extend that
emitter and the ChoiceEvent schema to serialize the reasoning as a reasoning
part while preserving existing content, finish-reason, and tool-call handling.

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📥 Commits

Reviewing files that changed from the base of the PR and between dac2534 and 0f4f468.

📒 Files selected for processing (4)

• packages/opentelemetry-instrumentation-groq/opentelemetry/instrumentation/groq/__init__.py
• packages/opentelemetry-instrumentation-groq/opentelemetry/instrumentation/groq/span_utils.py
• packages/opentelemetry-instrumentation-groq/tests/traces/test_init.py
• packages/opentelemetry-instrumentation-groq/tests/traces/test_reasoning.py

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