fix(CI): resolve flaky tests

[Leiyks]

This PR addresses several recurring flaky tests.

1. Kafka Integration Tests - Race Condition

Issue:
Kafka and Zookeeper start in parallel. Kafka attempts to connect before Zookeeper completes initialization.

Fix:

• .gitlab/generate-common.php: Added Zookeeper readiness check to Kafka entrypoint (waits for ruok/imok response)
• .gitlab/wait-for-service-ready.sh: Added Zookeeper service detection and native health check, increased Kafka settle time

2. CentOS Package Verification - Yum Timeouts

Issue:
verify centos failing with "Exiting on user cancel" - actually yum's 30-second stalled download timeout. Retries happened immediately, hitting same network issues.

Fix:

• dockerfiles/verify_packages/centos/install.sh: Increased yum timeout to 300s, added 5-second delay between retries

3. Profiling Tests - PHP 7.X jit allocation

Issue:
allocation_jit_01.phpt failing on PHP 7.X versions even tho jit feature is available for 8.0+ versions.

Fix:

• profiling/tests/phpt/allocation_jit_01.phpt: Added skip condition for PHP < 8.0 (consistent with other JIT tests)

4. Extension CI Tests - Valgrind Timeouts

Issue:
agent_sampling-standalone-asm_*.phpt timing out during valgrind run (second pass with memory checking). Valgrind causes slowdown which is enough to hit PHP 60s test timeout.

Fix:

• tests/ext/background-sender/agent_sampling-standalone-asm_*.phpt: Increased maxIteration and loop number of iterations

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.90%. Comparing base (4a26042) to head (88ce401).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3560      +/-   ##
==========================================
+ Coverage   61.81%   61.90%   +0.09%     
==========================================
  Files         140      140              
  Lines       13281    13281              
  Branches     1758     1758              
==========================================
+ Hits         8209     8221      +12     
+ Misses       4282     4272      -10     
+ Partials      790      788       -2     

see 2 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4a26042...88ce401. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2026-01-13 10:50:17

Comparing candidate commit 88ce401 in PR branch leiyks/fix-flaky-ci-tests with baseline commit 4a26042 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 30 metrics, 6 unstable metrics.

[datadog-datadog-prod-us1]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

🧪 2063 Tests failed

testSearchPhpBinaries from integration.DDTrace\Tests\Integration\PHPInstallerTest (Datadog) (Fix with Cursor)

Risky Test
phpvfscomposer://tests/vendor/phpunit/phpunit/phpunit:52

    testSimplePushAndProcess from laravel-58-test.DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest (Fix with Cursor)

testSimplePushAndProcess from laravel-8x-test.DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest::testSimplePushAndProcess
Test code or tested code printed unexpected output: spanLinksTraceId: 6966300e00000000d934a34407c4bed7
tid: 6966300e00000000
hexProcessTraceId: d934a34407c4bed7
hexProcessSpanId: 89e1581ee2fef71e
processTraceId: 15651314117602754263
processSpanId: 9935319142636648222

View all

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 88ce401 | Docs | Datadog PR Page | Was this helpful? Give us feedback!}