Add support to the exporter for Availability Data telemetry

[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.

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• Pull request includes test coverage for the included changes.

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Pull request overview

Adds log-based Availability Data telemetry support to the Azure Monitor OpenTelemetry exporter.

Changes:

• Maps microsoft.availability.* attributes to AvailabilityData.
• Adds unit coverage and an availability sample.
• Updates documentation and changelog.

Reviewed changes

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

Show a summary per file

File	Description
_constants.py	Defines availability attribute constants.
_exporter.py	Converts qualifying logs into availability telemetry.
test_logs.py	Tests conversion, validation, timestamps, and precedence.
sample_availability_data.py	Demonstrates availability logging.
samples/logs/README.md	Documents the new sample.
CHANGELOG.md	Records the feature.

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Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Suppressed comments (1)

sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/logs/_exporter.py:263

• The AvailabilityData schema caps message at 8,192 characters. The explicit attribute is currently unbounded, while the body fallback can reach 32,768 via _map_body_to_message, so either path can produce an invalid availability envelope; truncate the final message to the schema limit.

            message=(
                availability_data["message"]
                if "message" in availability_data
                else _map_body_to_message(log_record.body)
            ),

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