Add dynamic_service DBM propagation mode

[amarziali]

Description

Introduces a new DBM propagation mode value, dynamic_service, as a convenience alias for the combination of DD_DBM_PROPAGATION_MODE=service and DD_DBM_INJECT_SQL_BASEHASH=true. With a single setting, users get service-level SQL comment propagation (dddbs, ddps, etc.) plus the process-tags base hash injected as ddsh in the SQL comment and _dd.propagated_hash on the span, without needing to manage two separate variables.

Behavior:

• Same as service mode: no traceparent header, no _dd.dbm_trace_injected span tag
• Base hash (ddsh / _dd.propagated_hash) is always injected regardless of DD_DBM_INJECT_SQL_BASEHASH

Please note that this mode will replace service on the long term (and hence eventually also the DD_DBM_INJECT_SQL_BASEHASH will be deprecated/removed at same time)

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-datadog-prod-us1]

 

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⚠️ Warnings

🚦 43 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-php | benchmarks-tracer     

See error

Composer could not resolve dependencies due to security advisories affecting laravel/framework.

DataDog/apm-reliability/dd-trace-php | test_extension_ci: [7.0]     

See error

Failed to install live debugger span decoration probe in debugger_span_decoration_probe.phpt.

DataDog/apm-reliability/dd-trace-php | test_extension_ci: [7.4]     

See error

Test failure in crashtracker_collect_all_threads.phpt: Job failed due to a crash when collect_all_threads was enabled.

View all 43 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 1 job - 1 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 54.12% (-0.03%)

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Benchmarks [ tracer ]

Benchmark execution time: 2026-05-29 15:05:32

Comparing candidate commit 59ce771 in PR branch andrea.marziali/dbm-dynamic-service with baseline commit 095538e in branch master.

Found 0 performance improvements and 4 performance regressions! Performance is the same for 189 metrics, 1 unstable metrics.

scenario:MessagePackSerializationBench/benchMessagePackSerialization

• 🟥 execution_time [+3.507µs; +6.573µs] or [+3.459%; +6.483%]

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟥 execution_time [+2.353µs; +4.307µs] or [+2.314%; +4.235%]

scenario:PDOBench/benchPDOOverhead

• 🟥 execution_time [+6.837µs; +9.191µs] or [+2.775%; +3.731%]

scenario:PDOBench/benchPDOOverheadWithDBM

• 🟥 execution_time [+7.562µs; +10.536µs] or [+3.074%; +4.284%]