test(ffe): enable .NET agentless configuration source

[pavlokhrebto]

Motivation

DataDog/dd-trace-dotnet#9017 implements the .NET agentless Feature Flagging configuration source (FFL-2703). This enables the shared configuration-source contract for .NET, following the Node.js (#7355), Java (#7300), and Python (#7411) activations.

Changes

• Enable tests/parametric/test_ffe/test_configuration_sources.py for .NET from >=3.x.x.
• Add /ffe/start and /ffe/evaluate endpoints to the .NET parametric test app (FfeTestApi.cs), mirroring the Python and Java controllers.
• /ffe/start creates a DatadogProvider, sets it via Api.Instance.SetProvider(), and gets a client. The tracer's CallTarget instrumentation intercepts FeatureFlagsSdk.InitializeAsync to start agentless/RC delivery.
• /ffe/evaluate evaluates a flag using the OpenFeature client and returns {value, reason, errorCode} where errorCode is converted from the ErrorType enum to UPPER_SNAKE_CASE (e.g. ProviderNotReady → PROVIDER_NOT_READY) to match the test contract.
• Add Datadog.FeatureFlags.OpenFeature package reference (v2.3.1) to the parametric test app .csproj.

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

utils/build/docker/dotnet/parametric/Endpoints/FfeTestApi.cs            @DataDog/apm-dotnet @DataDog/asm-dotnet @DataDog/system-tests-core
manifests/dotnet.yml                                                    @DataDog/apm-dotnet @DataDog/asm-dotnet
utils/build/docker/dotnet/parametric/ApmTestApi.csproj                  @DataDog/apm-dotnet @DataDog/asm-dotnet @DataDog/system-tests-core
utils/build/docker/dotnet/parametric/Program.cs                         @DataDog/apm-dotnet @DataDog/asm-dotnet @DataDog/system-tests-core

[datadog-datadog-prod-us1]

 

⚠️ Warnings

🚦 4 Pipeline jobs failed

Testing the test | System Tests (dotnet, dev) / parametric / parametric (1)     

See error

Failed to build framework test server image. Error: Unable to find package Datadog.FeatureFlags.OpenFeature with version (>= 2.3.1). Nearest version found: 2.3.0.

Testing the test | System Tests (dotnet, dev) / parametric / parametric (2)     

See error

Unable to find package Datadog.FeatureFlags.OpenFeature with version (>= 2.3.1). Found nearest version: 2.3.0

Testing the test | System Tests (dotnet, prod) / parametric / parametric (1)     

See error

Unable to find package 'Datadog.FeatureFlags.OpenFeature' with version (>= 2.3.1) during 'dotnet restore'.

View all 4 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

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