Enable EVP flagevaluation system tests for Node.js

[leoromanovsky]

Motivation

Node.js needs the shared server-side EVP flagevaluation system-test contract enabled so reviewers can verify that the tracer and OpenFeature client changes emit the backend-visible evaluation signal consistently with the other SDKs. This PR gives the Node.js fanout a public system-tests companion for the customer-facing batching and aggregation behavior.

Changes

• Enables tests/ffe/test_flag_eval_evp.py for the validated Node.js express4 weblog in manifests/nodejs.yml at *ref_6_0_0; other Node.js weblogs remain incomplete_test_app.
• Splits the degradation test request into bounded targetingKeys batches so the test proves SDK aggregation without requiring one oversized app request.
• Keeps the EVP path constant aligned with the current merged system-tests contract.

Decisions

• Enable only express4 for this PR because that is the Node.js weblog covered by the companion tracer/OpenFeature validation.
• Keep degradation batching in the system test because app request body limits are separate from the SDK EVP payload-splitting behavior under review.
• Existing OTel metric coverage stays in tests/ffe/test_flag_eval_metrics.py; this PR is only for EVP flagevaluation.

Validation Evidence

System Tests

• Companion tracer PR: feat(openfeature): emit server-side EVP flagevaluation dd-trace-js#8902
• Companion OpenFeature client PR: Align Node.js flagevaluation EVP metadata openfeature-js-client#317
• This PR enables the system-test manifest surface used by those SDK PRs for Node.js EVP flagevaluation validation.

[github-actions]

CODEOWNERS have been resolved as:

manifests/nodejs.yml                                                    @DataDog/dd-trace-js
tests/ffe/test_flag_eval_evp.py                                         @DataDog/feature-flagging-and-experimentation-sdk @DataDog/system-tests-core

[datadog-prod-us1-6]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 4 Pipeline jobs failed

Testing the test | System Tests (nodejs, dev) / End-to-end #1 / express4 1     

🧪 8 Tests failed

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic.test_ffe_evp_flagevaluation_basic[express4] from system_tests_suite  

AssertionError: Timed out waiting for EVP flagevaluation event for flag evp-basic-flag
assert False
 +  where False = <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')>(<function wait_for_evp_flagevaluation_event.<locals>.<lambda> at 0x7f56c3b3ce00>, timeout=30)
 +    where <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')> = AgentInterfaceValidator('agent').wait_for
 +      where AgentInterfaceValidator('agent') = interfaces.agent

self = <tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic object at 0x7f56f4118590>

    def test_ffe_evp_flagevaluation_basic(self) -> None:
        assert self.r.status_code == 200, f"Flag evaluation failed: {self.r.text}"
...

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Burst_Aggregation.test_ffe_evp_flagevaluation_burst_aggregation[express4] from system_tests_suite  

AssertionError: Timed out waiting for EVP flagevaluation event for flag evp-burst-aggregation-flag
assert False
 +  where False = <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')>(<function wait_for_evp_flagevaluation_event.<locals>.<lambda> at 0x7f56c3c3e7a0>, timeout=30)
 +    where <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')> = AgentInterfaceValidator('agent').wait_for
 +      where AgentInterfaceValidator('agent') = interfaces.agent

self = <tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Burst_Aggregation object at 0x7f56f4119250>

    def test_ffe_evp_flagevaluation_burst_aggregation(self) -> None:
        for index, response in enumerate(self.responses):
...

View all 8 test failures

Testing the test | System Tests (php, prod) / End-to-end #1 / apache-mod-7.4-zts 1     

🧪 1 Test failed

tests.ffe.test_exposures.Test_FFE_Exposure_Events.test_ffe_multiple_remote_config_files[apache-mod-7.4-zts] from system_tests_suite  

AssertionError: Timed out waiting for exposure event for flags ['test-flag-1', 'test-flag-2'] and subject 'test-user-multi'
assert False
 +  where False = <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')>(<function wait_for_exposure_event.<locals>.<lambda> at 0x7f0e43126de0>, timeout=30)
 +    where <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')> = AgentInterfaceValidator('agent').wait_for
 +      where AgentInterfaceValidator('agent') = interfaces.agent

self = <tests.ffe.test_exposures.Test_FFE_Exposure_Events object at 0x7f0e69ee7710>

    def test_ffe_multiple_remote_config_files(self):
        """Test that FFE correctly handles multiple remote config files with different flags."""
...

Testing the test | System Tests (cpp_nginx, prod) / Build end-to-end (nginx)     

View all 4 failed jobs.

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

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[datadog-system-tests-org]

⚠️ Warnings

🚦 4 Pipeline jobs failed

Testing the test | System Tests (nodejs, dev) / End-to-end #1 / express4 1     

Testing the test | System Tests (php, dev) / End-to-end #1 / apache-mod-8.0 1     

Testing the test | System Tests (php, prod) / End-to-end #1 / apache-mod-7.3 1     

View all 4 failed jobs.

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: a03c3fb | Docs | Give us feedback!}