fix(llamaindex): add safety for "None" attributes, and add key fallback

[christabella]

• Replace raw span.set_attribute(...) calls with the existing _set_span_attribute helper that guards against None
• Read model_dict.get("model") or model_dict.get("model_name") for the request model, since LlamaIndex populates model_name on LLM model dicts

This prevents OTEL collectors e.g. Datadog from emitting warnings when llamaIndex emits an LLM chat event and model_dict keys "model" and "temperature" are absent.

Summary by CodeRabbit

• Bug Fixes
  • Improved model information captured for LLM chat requests by using the available model value and a fallback when needed.
  • Prevented blank or missing model details from being recorded.
  • Removed request temperature instrumentation.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: bcdd61cc-7151-46e4-a632-b74471473907

📥 Commits

Reviewing files that changed from the base of the PR and between 62e24c2 and a22fa37.

📒 Files selected for processing (1)

• packages/opentelemetry-instrumentation-llamaindex/opentelemetry/instrumentation/llamaindex/span_utils.py

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📝 Walkthrough

Walkthrough

The LLamaIndex span utility now records the request model from model or model_name. It skips unset or empty model values and no longer records request temperature.

Changes

LLamaIndex instrumentation

Layer / File(s)	Summary
Request attribute handling packages/opentelemetry-instrumentation-llamaindex/.../span_utils.py	Request model attribution uses model with model_name as a fallback. _set_span_attribute suppresses unset and empty values. Request temperature attribution was removed.

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

Merge Risk: ⚪ Minimal · up to a22fa

This localized change safely handles missing attributes and adds a model-name fallback for LlamaIndex telemetry; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 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 summarizes the main changes: safe handling of None attributes and fallback key support in LlamaIndex instrumentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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