Add upstream dependency compatibility regression tests

[Hector Hernandez (hectorhdzg)]

Summary

• add network-isolated contract tests for Azure resource detectors and core OpenTelemetry SDK behavior
• validate dependency imports, plugin registration, and Azure Monitor/OTLP exporter construction
• add service.instance.id regression coverage for worker uniqueness, fork refresh, AKS/VM precedence, and bounded cardinality
• document known OpenTelemetry SDK 1.44 precedence defects as strict expected failures

[github-actions]

Performance comparison

Threshold: regressions >15.0% on gating scenarios fail the build. Higher ops/s is better; positive Δ means the PR is slower.

Scenario	Gating	Baseline (ops/s)	Candidate (ops/s)	Δ %	Status
azure_monitor_log	yes	16,530.6	16,690.9	-0.96%	✅
azure_monitor_span	yes	149,209.2	156,445.6	-4.63%	✅
otel_log	no	18,968.5	19,157.8	-0.99%	✅
otel_span	no	40,638.8	41,640.6	-2.41%	✅

[Copilot]

Copilot review overview

🟡 Changes recommended

Known defects are not collected as strict expected failures, and some compatibility assertions do not validate their intended contracts.

Review effort: Balanced
Findings: 3

Open (3)

• Allow additive Azure detectors while checking required plugins · New
• Spy on processor flush to verify force_flush contract · New
• Enable strict xfail for precedence defects · New

What changed in this PR

Adds isolated compatibility tests covering upstream OpenTelemetry and Azure dependencies.

Changes:

• Tests SDK telemetry contracts and plugin/exporter compatibility.
• Covers Azure resource detection and service.instance.id behavior.
• Blocks external network access during upstream tests.

File	Description
tests/​upstream/​__init__.py	Defines the upstream test package.
tests/​upstream/​conftest.py	Adds network-isolation fixtures.
tests/​upstream/​test_azure_resource_detectors.py	Tests Azure detector contracts.
tests/​upstream/​test_dependency_plugins.py	Checks dependencies, plugins, and exporters.
tests/​upstream/​test_opentelemetry_sdk_contracts.py	Exercises core SDK behavior.
tests/​upstream/​test_service_instance_id_regressions.py	Covers instance-ID precedence and fork behavior.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The changes are comprehensive, isolated tests with intentional strict coverage for known upstream defects.

Review effort: Balanced
Findings: None

Resolved since last review (3)

• Enable strict xfail for precedence defects
• Spy on processor flush to verify force_flush contract
• Allow additive Azure detectors while checking required plugins

[Copilot]

Copilot review overview

🟢 Approval recommended

The regression tests are comprehensive, isolated, and pass across the supported Python versions.

Review effort: Balanced
Findings: None