test(dotnet): enable agentless EVP exposure egress

[leoromanovsky]

Motivation

Agentless CDN-delivered configuration simplifies customer deployments only if Feature Flags telemetry also has a reliable path out of the process: discover a compatible Agent or serverless-init relay, otherwise use direct EVP intake.

FFLSDK-195 enables .NET against the shared contract from merged #7299.

Changes

Capability (poc only)	Direct intake	Serverless-init
Exposure delivery, identity, route-specific credentials	Enabled	Enabled
Exposure flush after HTTP shutdown	Enabled	Not added

• Activation gate: v3.55.0.
• Correct all three exposure gates from v3.54.0 to v3.55.0.
• Preserve poc-only activation and the opt-in PID 1/ApplicationStopped shutdown marker.
• Leave UDS and other weblogs disabled for this no-Agent topology.
• Merge main and retain only the language-specific delta; no duplicated foundation or weakened shared assertions.

Decisions

• Keep this an enablement PR: manifests and only necessary server/proxy wiring; no bespoke harness self-tests.

• Target main directly, independently of other language enablers.

• dd-trace-dotnet#9044 is merged and configuration lifecycle is released in v3.54.0. Fallback #9235 remains open. Correct the stale fallback gate to current master's v3.55.0 and reconfirm it when the SDK PR lands.

• Keep this exposure-only. Flag-evaluation emission is separate (FFLSDK-28).

• Keep OTLP and new fault-injection harness work out of scope.

Validation

Base: 8770fe3d914d8f7028c1d4177292acc5b5498a34
Candidate: 701c9a30ab7c8f5d9b1cf5b2884c74442f9ff3ba (signed; GitHub verified).

• ./format.sh --check — passed on the cleaned worktree, using Python 3.12 with PYTHONPATH=$PWD.
• Removed redundant manifest/source-text self-tests. Existing shared harness tests and real E2E contracts are unchanged.
• Fresh direct/serverless-init E2E was not rerun for this cleanup. Historical artifact runs and former harness-test counts are not current-head product evidence.
• Current-head CI and actual event-delivery E2E remain approval gates. No staging or production-intake claim.

[github-actions]

CODEOWNERS have been resolved as:

manifests/dotnet.yml                                                    @DataDog/system-tests-reviewers
utils/build/docker/dotnet/weblog/Program.cs                             @DataDog/system-tests-reviewers
utils/build/docker/dotnet/weblog/app.sh                                 @DataDog/system-tests-reviewers

[datadog-prod-us1-3]

 

❌ Errors

Your PR has failed checks. Please review the issues below and take necessary action before merging.

🚦 2 Pipeline jobs failed

Testing the test | System Tests (dotnet, dev) / End-to-end #13 / poc 13 — ❌ 1 test failed

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❌ pytest.internal[poc] from system_tests_suite

internal error

Traceback (most recent call last):
  File "/home/runner/work/system-tests/system-tests/utils/_context/_scenarios/agentless_endtoend.py", line 657, in _wait_and_stop_containers
    self._wait_for_expected_evp_captures(is_empty_test_run=is_empty_test_run)
  File "/home/runner/work/system-tests/system-tests/utils/_context/_scenarios/agentless_endtoend.py", line 650, in _wait_for_expected_evp_captures
    raise RuntimeError(f"Timed out waiting for Feature Flags EVP captures: {', '.join(missing_paths)}")
RuntimeError: Timed out waiting for Feature Flags EVP captures: /api/v2/exposures

During handling of the above exception, another exception occurred:
...

Testing the test | all-jobs-are-green

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ℹ️ Info

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❄️ No new flaky tests detected

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