Migrate SLF4J Simple test setup to a convention plugin

[bric3]

What Does This Do

Replaces the SLF4J Simple test script with a convention plugin and migrates its consumers.

Motivation

Keeps the shared test logging setup typed and reusable while preserving its behavior.

Additional Notes

This convention lands in the preferred build-logic/ location because projects apply it directly, on demand. It could move to buildSrc/, but that is not the desired goal. Conventions should move there only when their types or plugins must be visible to other buildSrc/ plugins or legacy script plugins through Gradle’s shared build-script classloader.

[datadog-prod-us1-5]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 58.60% (-0.19%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: cef1917 | Docs | View more details | Give us feedback!}

[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	14.03 s	13.97 s	[-0.4%; +1.3%] (no difference)
startup:insecure-bank:tracing:Agent	12.90 s	12.98 s	[-1.5%; +0.2%] (no difference)
startup:petclinic:appsec:Agent	16.87 s	16.74 s	[-0.1%; +1.7%] (no difference)
startup:petclinic:iast:Agent	16.78 s	16.91 s	[-1.6%; +0.0%] (no difference)
startup:petclinic:profiling:Agent	16.76 s	16.90 s	[-2.0%; +0.3%] (no difference)
startup:petclinic:sca:Agent	16.74 s	16.53 s	[+0.2%; +2.4%] (maybe worse)
startup:petclinic:tracing:Agent	16.09 s	16.13 s	[-1.4%; +0.9%] (no difference)

Commit: cef19178 · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.

[datadog-prod-us1-5]

More details

The convention plugin keeps the prior configuration matching, dependency replacement, and test JVM arguments. All four users move to the new plugin.

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[bric3]

/merge

[gh-worker-devflow-routing-ef8351]

View all feedbacks in Devflow UI.

2026-08-24 09:02:48 UTC ℹ️ Start processing command /merge

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2026-08-24 09:02:53 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in master is approximately 2h (p90).

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2026-08-24 09:03:45 UTC ⚠️ MergeQueue: This merge request build was cancelled

brice.dutheil@datadoghq.com cancelled this merge request build

[bric3]

/merge -c

[gh-worker-devflow-routing-ef8351]

View all feedbacks in Devflow UI.

2026-08-24 09:03:36 UTC ℹ️ Start processing command /merge -c

[bric3]

/merge

[gh-worker-devflow-routing-ef8351]

View all feedbacks in Devflow UI.

2026-08-25 10:34:45 UTC ℹ️ Start processing command /merge

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2026-08-25 10:34:51 UTC ℹ️ MergeQueue: Pull request is not mergeable yet

It will be processed automatically as soon as GitHub reports it as mergeable. View in MergeQueue UI.

• Run /code blockers to see what is blocking it.
• Run /remove to cancel it.

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2026-08-25 11:22:13 UTC ℹ️ MergeQueue: merge request added to the queue

The expected merge time in master is approximately 2h (p90).

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2026-08-25 12:14:29 UTC ℹ️ MergeQueue: This merge request was merged