Add otel endpoint in weblog [php@MilanGarnier/propagation-behavior-extract]

[MilanGarnier]

Motivation

• Add a PHP weblog endpoint that extracts distributed tracing context via the
  OTel propagator API and forwards a request to a downstream URL. This is needed
  to test DD_TRACE_PROPAGATION_BEHAVIOR_EXTRACT behavior (restart / ignore)
  when context extraction goes through the OTel drop-in bridge.
• Enabling tests for feature DD_TRACE_PROPAGATION_BEHAVIOR_EXTRACT for feat(tracing): add DD_TRACE_PROPAGATION_BEHAVIOR_EXTRACT dd-trace-php#3997

Changes

• New endpoint GET /otel_drop_in_extract_and_make_distant_call?url=<url>
  (utils/build/docker/php/common/otel_drop_in_extract_and_make_distant_call.php):
  • Extracts incoming trace context using OpenTelemetry\API\Globals::propagator()->extract(),
    which the DDTrace bridge maps to consume_distributed_tracing_headers.
  • Creates an OTel server span parented to the extracted context.
  • Makes an outbound cURL request to the provided url, propagating the
    active context through DDTrace's auto-instrumentation.
  • Returns JSON with url, status_code, request_headers, and
    response_headers for assertion in tests.
• Rewrite rule added in rewrite-rules.conf (with [QSA] to preserve
  the url query parameter).
• Enables Test_ExtractBehavior_Restart_Otel for PHP >= 8.1 versions

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/php/common/otel_drop_in_extract_and_make_distant_call.php  @DataDog/apm-php @DataDog/system-tests-core
manifests/php.yml                                                       @DataDog/apm-php @DataDog/asm-php
utils/build/docker/php/common/rewrite-rules.conf                        @DataDog/apm-php @DataDog/system-tests-core

[datadog-datadog-prod-us1]

 

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⚠️ Warnings

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Testing the test | System Tests (php, dev) / Get parameters / Get parameters     

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🧪 All tests passed
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[datadog-system-tests-org]

⚠️ Warnings

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

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 5edaf2c2e8

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[nccatoni]

All good for me (@DataDog/system-tests-core) but you should get a review from someone in the php team