Enable EVP flagevaluation system tests for PHP

[leoromanovsky]

Motivation

tests/ffe/test_flag_eval_evp.py now covers the server-side EVP flagevaluation contract. PHP has a passing local focused run against DataDog/dd-trace-php#3984, so its manifest can move from missing_feature (FFL-2446) to the validated version.

Changes

• Enables tests/ffe/test_flag_eval_evp.py for PHP in manifests/php.yml at v1.21.0-dev.
• Keeps the test implementation in the base system-tests PR Add EVP flagevaluation system tests #7146.
• Keeps this as a sibling PR based on leo.romanovsky/ffe-evp-flagevaluation-system-tests, not stacked on other language enablement branches.

Decisions

• This PR enables only PHP; other languages are enabled by separate sibling PRs after their own local pass evidence.
• The degradation case is active for PHP and uses the production per-flag full-tier cap through the base test.
• Existing OTel metric coverage stays in tests/ffe/test_flag_eval_metrics.py.

Validation

Validated on 2026-06-17 with system-tests PHP enable commit a29bfcfa1b2fa172adfee5f61a2a3424456763ae, base #7146 commit 2e7ad616bc525ee76698f34a686da549701b1914, PHP SDK commit 696c397f3ad7fd9b8b2135e16c9424c49a55da1f, and libdatadog commit 53f81e56510f9981dd7db95a9dc7dec592cb9678.

• ./build.sh php -w apache-mod-8.2 - PASS.
• ./run.sh FEATURE_FLAGGING_AND_EXPERIMENTATION --library php --weblog apache-mod-8.2 -k "Flagevaluation_Degradation" - PASS, 1 passed, 2584 deselected in 34.38s.
• ./run.sh FEATURE_FLAGGING_AND_EXPERIMENTATION --library php --weblog apache-mod-8.2 -k "test_flag_eval_evp" - PASS, 8 passed, 2577 deselected in 63.53s.
• Agent 7.80.1; library php@1.21.0; weblog apache-mod-8.2; Linux aarch64.
• Degradation payload evidence from the passing full run: events=10001, total=10050, full_total=10000, degraded_count=1, degraded_total=50.
• PHP local validation used a PHP 8.2 aarch64 ddtrace.so built from DataDog/dd-trace-php#3984 with libdatadog 53f81e565, installed through the system-tests /binaries/ddtrace.so override.

[github-actions]

CODEOWNERS have been resolved as:

manifests/php.yml                                                       @DataDog/apm-php @DataDog/asm-php

[datadog-official]

 

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⚠️ Warnings

🚦 51 Pipeline jobs failed

Testing the test | System Tests (php, dev) / End-to-end #1 / apache-mod-7.0 1     

🧪 1 Test failed

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic.test_ffe_evp_flagevaluation_basic[apache-mod-7.0] 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 0x7ff2fb765760>, 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 0x7ff3292c4740>

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

Testing the test | System Tests (php, dev) / End-to-end #1 / apache-mod-7.0-zts 1     

🧪 1 Test failed

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic.test_ffe_evp_flagevaluation_basic[apache-mod-7.0-zts] 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 0x7f666fbb51c0>, 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 0x7f669ca5c950>

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

Testing the test | System Tests (php, dev) / End-to-end #1 / apache-mod-7.1 1     

🧪 1 Test failed

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic.test_ffe_evp_flagevaluation_basic[apache-mod-7.1] 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 0x7f20f86fe480>, 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 0x7f2124f680e0>

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

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