🍒 12028 - Stamp _dd.apm.enabled on every exported chunk when APM tracing is disabled

[claponcet]

Backport #12028 to release/v1.64.x

[dd-octo-sts]

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[datadog-datadog-prod-us1]

More details

The export-path change correctly applies _dd.apm.enabled:0 after sampling to every span in every accepted chunk, including rootless late-child and partial-flush chunks, while leaving APM-enabled traces unchanged. The targeted test could not execute in this sandbox because Java 25 is unavailable and Gradle downloads are blocked; source review found no clear behavioral regression.

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[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	14.00 s	14.00 s	[-0.6%; +0.6%] (no difference)
startup:insecure-bank:tracing:Agent	12.92 s	13.01 s	[-1.3%; +0.1%] (no difference)
startup:petclinic:appsec:Agent	17.48 s	17.06 s	[+1.4%; +3.4%] (significantly worse)
startup:petclinic:iast:Agent	17.26 s	16.93 s	[-2.4%; +6.3%] (no difference)
startup:petclinic:profiling:Agent	17.37 s	17.25 s	[-0.9%; +2.3%] (no difference)
startup:petclinic:sca:Agent	17.54 s	17.37 s	[+0.2%; +1.7%] (maybe worse)
startup:petclinic:tracing:Agent	16.57 s	16.54 s	[-0.7%; +1.2%] (no difference)

Commit: d5141875 · CI Pipeline · Benchmarking Platform UI

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