Support httpx2 entry point exposed by the opentelemetry-instrumentation-httpx 0.65b0

[Radhika Gupta (rads-1996)]

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

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[Copilot]

🟡 Changes recommended

The shared dependency check produces warnings when only one of httpx or httpx2 is installed.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Adds Azure Monitor distro support for the new httpx2 OpenTelemetry instrumentation entry point.

Changes:

• Enables and tests httpx2 instrumentation.
• Adds its development dependency, documentation, sample configuration, and changelog entry.

File summaries

File	Description
tests/utils/test_configurations.py	Updates expected default configurations.
tests/instrumentation/test_httpx.py	Exercises both HTTPX instrumentors.
samples/tracing/instrumentation_options.py	Demonstrates enabling httpx2.
README.md	Documents httpx2 support.
dev_requirements.txt	Adds the test dependency.
CHANGELOG.md	Records the feature.
_constants.py	Enables the new entry point by default.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 1
• Review effort level: Balanced

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