[kaahos]

What does this PR do?:
Correct the build-JDK requirement in AGENTS.md from JDK 17+ to JDK 21+. Preserve the distinction between the build JDK and JAVA_TEST_HOME.

Motivation:
PROF-16537: agent guidance contradicts the JDK 21+ project prerequisite in README.md. Gradle's own minimum JVM version is not the project's chosen build requirement.

Additional Notes:

• Documentation only: one changed line in AGENTS.md. No build configuration, CI, formatter, bytecode target or runtime behavior changes.
• Independent committed-range code-review completed with no findings or waivers. This is not merge approval.

How to test the change?:

• passed: scoped :spotlessApply :spotlessCheck -PspotlessIdeHook=AGENTS.md --max-workers=2 --no-build-cache through ./.claude/commands/build-and-summarize on JDK 25.0.4.1. This is not a full-repository formatting result.
• passed: copyright, canonical CLAUDE.md, knowledgebase and documentation-index checks; git diff --check; exact one-line scope assertion.
• passed: requirement checked against README.md, doc/building/JdkUpgrades.md and the existing JDK 21 CI configuration.
• not applicable: profiler/native runtime tests; no executable behavior changes.

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a security review (run the dd:platform-security-review
  skill, or file a request via the PSEC review form).
  bewaire also runs automatically on every PR.
• This PR doesn't touch any of that.
• JIRA: PROF-16537

Unsure? Have a question? Request a review!

[chatgpt-codex-connector]

Codex Review Summary: ✅ Completed

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

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-10T11:10:58.353537Z	bb77356	Draft marked ready

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[datadog-prod-us1-5]

More details

The JDK 21+ build guidance matches the documented project prerequisite and existing CI configuration while preserving the separate JAVA_TEST_HOME setting.

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[dd-octo-sts]

Scan-Build Report

User:	runner@runnervmwuk1x
Working Directory:	/home/runner/work/java-profiler/java-profiler/ddprof-lib/src/test/make
Command Line:	make -j4 all
Clang Version:	Ubuntu clang version 21.1.8 (6ubuntu1)
Date:	Tue Nov 10 19:20:49 2026

Bug Summary

Bug Type	Quantity	Display?
All Bugs	2
Logic error
Dereference of null pointer	1
Unused code
Dead initialization	1

Filter Results by File

Reports

Bug Group	Bug Type ▾	File	Function/Method	Line	Path Length
Unused code	Dead initialization	referenceChains.cpp	applyOomRamp	497	1
Logic error	Dereference of null pointer	perfEvents_linux.cpp	unregisterThread	720	26

[dd-octo-sts]

CI Test Results

Run: #42884078847 | Commit: 25a2492 | Duration: 20m 4s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	✅	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 32 | Failed: 0

---

Updated: 2026-11-10 19:41:40 UTC

[dd-octo-sts]

✅ All 40 integration tests passed

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