Adds process_tags to the first span of each tracing payload

[dubloom]

Description

This PR implements this RFC for the tracing product.

Add process_tags in APM payload. According to the RFC, the tag _dd.tags.process is set in the first first span of each payload.

The set tag are:

• entrypoint.workdir. The working dir name, should be the last path segment.
• entrypoint.name. The entrypoint of the application. It is the the script name. Set to none if php is executed as an executable.
• entrypoint.type. Either script or executable
• entrypoint.basedir. The base dir is the directory where the called executable resides. Should be the last path segment.
• runtime.sapi. The name of the SAPI in which PHP is run.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-datadog-prod-us1]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

🧪 1024 Tests failed

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

    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: 696dfa6000000000493e52fa657a584f
tid: 696dfa6000000000
hexProcessTraceId: 493e52fa657a584f
hexProcessSpanId: 3708a31acc33f4b0
processTraceId: 5277747048722618447
processSpanId: 3965598807390155952

phpvfscomposer://tests/vendor/phpunit/phpunit/phpunit:106

View all

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 89c75b2 | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.93%. Comparing base (1316514) to head (89c75b2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3566      +/-   ##
==========================================
- Coverage   62.02%   61.93%   -0.10%     
==========================================
  Files         140      140              
  Lines       13309    13309              
  Branches     1762     1762              
==========================================
- Hits         8255     8243      -12     
- Misses       4265     4275      +10     
- Partials      789      791       +2     

see 2 files with indirect coverage changes

---

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[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2026-01-19 10:28:35

Comparing candidate commit 89c75b2 in PR branch dubloom/process-tags with baseline commit 1316514 in branch master.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 192 metrics, 0 unstable metrics.

scenario:ComposerTelemetryBench/benchTelemetryParsing

• 🟩 execution_time [-1297.555ns; -302.445ns] or [-10.059%; -2.345%]

scenario:ComposerTelemetryBench/benchTelemetryParsing-opcache

• 🟩 execution_time [-1.962µs; -0.838µs] or [-15.209%; -6.496%]

[bwoebi]

Looks good :-)