Enable EVP flagevaluation system tests for Node.js

[leoromanovsky]

Motivation

Node.js now has local passing evidence for the server-side EVP flagevaluation system tests added in #7146. This stacked PR enables the manifest entry for Node.js only, keeping other SDK languages disabled until their own local validation passes.

Changes

• Enables tests/ffe/test_flag_eval_evp.py for Node.js from v6.0.0.
• Leaves all other Node.js FFE manifest entries unchanged.
• Keeps this PR based on leo.romanovsky/ffe-evp-flagevaluation-system-tests, not stacked on another language enablement branch.

Decisions

• This PR stays draft until the Node.js SDK PR and base system-tests PR are reviewed together.
• The enablement is language-scoped; other SDK manifests remain disabled until their own evidence is collected.
• Local validation used the existing Node.js system-tests local tracer workflow with binaries/nodejs-load-from-local pointing at the SDK PR checkout.

Evidence

Local run on 2026-06-17 UTC:

• SDK commit: 7ed3ffc08913cf25cc6aab8fffb417536851cebe
• system-tests commit: 739deccd4e8c84e416706eb20315c9f706fcb07f
• Weblog: nodejs / express4
• Runtime context: Agent 7.80.1; library nodejs@6.0.0-pre; Linux aarch64

Commands:

./utils/build/build_nodejs_base_images.sh express4
./build.sh nodejs -w express4
./run.sh FEATURE_FLAGGING_AND_EXPERIMENTATION -k "test_flag_eval_evp"

Result: 8 passed, 2577 deselected in 57.08s.

Agent-visible EVP checks from /api/v2/flagevaluations payloads:

• evp-count-flag: 5 evaluations -> 1 event, evaluation_count=5
• evp-burst-aggregation-flag: 512 evaluations -> 1 event, evaluation_count=512
• evp-high-cardinality-aggregation-flag: 128 distinct buckets -> 128 events, total evaluation_count=128
• evp-degradation-flag: 10,050 evaluations -> 10,001 events, including 1 degraded bucket with evaluation_count=50

Local logs:

• .tmp/evidence/nodejs-build-express4-base-local-20260617T030300Z.log
• .tmp/evidence/nodejs-build-express4-local-20260617T030359Z.log
• .tmp/evidence/nodejs-test_flag_eval_evp-local-20260617T030436Z.log

[github-actions]

CODEOWNERS have been resolved as:

manifests/nodejs.yml                                                    @DataDog/dd-trace-js

[datadog-prod-us1-4]

 

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⚠️ Warnings

🚦 7 Pipeline jobs failed

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

🧪 4 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 0x7f5d1ee5e700>, 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 0x7f5d4d10fd10>

    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 0x7f5d1f6f6520>, 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 0x7f5d4d10eb40>

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

View all 4 test failures

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

🧪 4 Tests failed

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

AssertionError: Flag evaluation failed: <!DOCTYPE html>
  <html lang="en">
  <head>
  <meta charset="utf-8">
  <title>Error</title>
  </head>
  <body>
  <pre>Cannot POST /ffe</pre>
  </body>
  </html>
...

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

AssertionError: Request 1 failed: <!DOCTYPE html>
  <html lang="en">
  <head>
  <meta charset="utf-8">
  <title>Error</title>
  </head>
  <body>
  <pre>Cannot POST /ffe</pre>
  </body>
  </html>
...

View all 4 test failures

Testing the test | System Tests (nodejs, dev) / End-to-end #1 / express5 1     

🧪 3 Tests failed

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic.test_ffe_evp_flagevaluation_basic[express5] 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 0x7fa959df7c40>, 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 0x7fa9885a13d0>

    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[express5] 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 0x7fa959f54fe0>, 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 0x7fa9885a05c0>

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

View all 3 test failures

View all 7 failed jobs.

ℹ️ Info

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❄️ No new flaky tests detected

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