Adds container tags support for DBM

[dubloom]

This PR implements the container tags support for DBM as described in this RFC.

Tracers communicate their containerID through a request http header that can be back propagate by the agent. This feature is implemented in the agent in this libdatadog PR: DataDog/libdatadog#1700.

We use this container tags hash alongside process tags to compute a hash called base_hash. This base_hash is injected in DBM comments and DBM spans.

Note that the base_hash should be computed as soon as process tags are available because if the tracer is not run within a container, it will never receive a container_tags_hash.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.73%. Comparing base (a8ee11d) to head (2dda062).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3708      +/-   ##
==========================================
- Coverage   68.74%   68.73%   -0.02%     
==========================================
  Files         166      166              
  Lines       19030    19030              
  Branches     1797     1797              
==========================================
- Hits        13082    13080       -2     
- Misses       5132     5135       +3     
+ Partials      816      815       -1     

Flag	Coverage Δ
helper-rust-integration	78.82% <ø> (ø)
helper-rust-unit	49.36% <ø> (ø)

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see 1 file with indirect coverage changes

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[datadog-datadog-prod-us1]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

❄️ 1 New flaky test detected

testBaseHashNotInjectedWhenDisabled from integration.DDTrace\Tests\Integration\DatabaseMonitoringTest (Datadog) (Fix with Cursor)

DDTrace
Error: Call to undefined method DDTrace

tests/Integration/DatabaseMonitoringTest.php:392
tests/Common/RetryTraitVersionSpecific70.php:28
phpvfscomposer://tests/vendor/phpunit/phpunit/phpunit:52

🧪 13 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 (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest::testSimplePushAndProcess
Test code or tested code printed unexpected output: spanLinksTraceId: 69bd7d4f000000004be61bafb5352f8f
tid: 69bd7d4f00000000
hexProcessTraceId: 4be61bafb5352f8f
hexProcessSpanId: 7b43ae1b6d700b7c
processTraceId: 5469089238961434511
processSpanId: 8882134322928159612

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

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: 69bd8b3500000000039588c67a9b3f2b
tid: 69bd8b3500000000
hexProcessTraceId: 039588c67a9b3f2b
hexProcessSpanId: d37c2e95832e2627
processTraceId: 258262939685568299
processSpanId: 15239106458800760359

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

View all

_{This comment will be updated automatically if new data arrives.
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[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2026-03-20 18:08:49

Comparing candidate commit 2dda062 in PR branch dubloom/container-back-propagation-implem with baseline commit a8ee11d in branch master.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 192 metrics, 1 unstable metrics.

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟥 execution_time [+3.281µs; +4.699µs] or [+3.136%; +4.491%]

[bwoebi]

Thanks, looks correct to me, ship it!