Clarify nested Gradle cleanup failures

[bric3]

What Does This Do

Report an existing nested Gradle user home that could not be cleaned up, with a pointer to the shutdown and cleanup warnings. Document the separate timeout budgets, the preservation policy, and the internal daemon log naming shared with the buildSrc fixture.

Motivation

Follow-up to review comment on

• Fix nested Gradle daemon cleanup races #12782

A user home preserved after uncertain daemon shutdown is currently reported as a creation failure.

Additional Notes

Contributor Checklist

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T13:36:18.727130Z	480004d	Draft marked ready
🔒 Security Review	✅ Completed 2026-10-08T13:37:03.458219Z	480004d	Draft marked ready

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[bric3]

@dougqh I addressed your comments here : #12782 (review)

[datadog-datadog-prod-us1-2]

More details

Retained nested Gradle user homes now produce a cleanup-specific diagnostic. The reviewed guard preserves the existing daemon shutdown, timeout, and directory-retention behavior.

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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	13.96 s	13.98 s	[-1.2%; +0.9%] (no difference)
startup:insecure-bank:tracing:Agent	12.87 s	13.03 s	[-2.0%; -0.4%] (maybe better)
startup:petclinic:appsec:Agent	16.71 s	16.82 s	[-5.0%; +3.7%] (no difference)
startup:petclinic:iast:Agent	16.80 s	16.96 s	[-1.6%; -0.2%] (maybe better)
startup:petclinic:profiling:Agent	16.62 s	16.90 s	[-2.8%; -0.5%] (maybe better)
startup:petclinic:sca:Agent	17.00 s	17.00 s	[-0.9%; +1.0%] (no difference)
startup:petclinic:tracing:Agent	16.00 s	16.02 s	[-1.2%; +0.9%] (no difference)

Commit: 480004d6 · 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.