Fix the duplicate chat spans issues and http spans not propagating in langchain

[rads-1996]

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[Copilot]

Pull request overview

This PR addresses LangChain tracing issues by ensuring HTTP/OpenAI child spans inherit the correct parent context (via runtime context attach/detach) and by preventing duplicate OpenAI v2 spans when overlapping GenAI instrumentations are present.

Changes:

• Attach/detach LangChain run spans to the OpenTelemetry runtime context to improve downstream HTTP span parenting, and force LangChain tracer callbacks to run inline.
• Add distro logic to auto-disable openai (v2) instrumentation when overlapping libraries are detected, while preserving explicit user configuration.
• Extend/adjust tests to validate the new behavior (context attach/detach, openai auto-disable rules, and langchain instrumentor no-op behavior).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/test_distro.py	Updates end-to-end expectations and adds unit tests for openai v2 auto-disable behavior.
tests/langchain/test_tracer.py	Adds tests covering runtime context attach/detach and run_inline behavior.
tests/langchain/test_tracer_instrumentor.py	Adjusts expectations for instrumentor behavior when langchain is unavailable.
src/microsoft/opentelemetry/_utils.py	Introduces _disable_openai_v2_instrumentation() helper to auto-disable openai v2 when overlaps exist.
src/microsoft/opentelemetry/_genai/_langchain/_tracer.py	Attaches LangChain spans to runtime context and detaches on end to fix child-span parenting.
src/microsoft/opentelemetry/_distro.py	Calls _disable_openai_v2_instrumentation() during instrumentation setup.

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[rads-1996]

HTTP spans disabled -

HTTP spans enabled -

[rads-1996]

Before -

After -

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

src/microsoft/opentelemetry/_utils.py:171

• This auto-disables openai whenever langchain_core/agent_framework is importable, even if the user has explicitly disabled the conflicting instrumentation via instrumentation_options (e.g. {'langchain': {'enabled': False}}). That can unexpectedly turn off OpenAI tracing in apps that merely have LangChain installed. Consider also checking whether langchain / agent_framework instrumentation is enabled before forcing openai.enabled=False (consistent with _is_instrumentation_enabled in _distro.py).

    overlapping_present = any(
        find_spec(import_name) is not None for import_name in ("langchain_core", "agent_framework")
    )

    if not overlapping_present:
        return