Repeatable playbook
- Confirm which process (
top, container cgroup). - Take 3 thread dumps 10 seconds apart — same
RUNNABLEstack wins. - If GC threads dominate, pivot to GC logs / JFR GC events.
- If JIT compiler threads spike briefly, compare against deploy time (warm-up).
- Fix the hot method, add a test, redeploy, re-profile.
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Test yourself
Answer these before moving on — recall is what makes it stick.