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Add kubernetes-deployment: probes, shutdown, JVM ergonomics, HPA

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Companion code for "Deploying Spring Boot 4 on Kubernetes: Probes, Graceful
Shutdown, Limits and JVM Ergonomics". A dependency outage under three
probe-group setups, a rolling restart under load four ways (three runs
each), the JVM's ergonomic choices for nine pod shapes, one GC-heavy load
under five CPU limits with throttling counters, and an HPA driven by a
Micrometer gauge through prometheus-adapter. Measured on k3s v1.36.4.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01C3TETMrqVUWeFkNtz3Jbo3
This commit is contained in:
asmhatre
2026-09-11 17:12:10 +00:00
co-authored by Claude Opus 5
parent 644da9e65e
commit a065696478
72 changed files with 28415 additions and 2 deletions
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kubernetes-deployment/docs/output/jvm-ergonomics.txt
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# JVM ergonomics per pod resources. Image: sbd/k8s-demo:1, no JVM options. Node: 2 CPUs.
# cgroup v1 node; see docs/03-jvm-ergonomics.md for the v2 equivalents.
cpu.req cpu.lim mem.req mem.lim | CPUs GC MaxHeap PGCThr CGCThr JITThr
100m none 256Mi 2Gi | 2 G1GC 512M 2 1 2
100m 500m 256Mi 512Mi | 1 SerialGC 128M 0 0 2
100m 1 256Mi 1Gi | 1 SerialGC 256M 0 0 2
100m 1 256Mi 2Gi | 1 SerialGC 512M 0 0 2
100m 1500m 256Mi 2Gi | 2 G1GC 512M 2 1 2
100m 2 256Mi 1Gi | 2 SerialGC 256M 0 0 2
100m 2 256Mi 1700Mi | 2 SerialGC 426M 0 0 2
100m 2 256Mi 1800Mi | 2 G1GC 450M 2 1 2
100m 2 256Mi 4Gi | 2 G1GC 1024M 2 1 2
# java -XshowSettings:system for the 1500m case:
Operating System Metrics:
Provider: cgroupv1
Effective CPU Count: 2
CPU Period: 100000us
CPU Quota: 150000us
CPU Shares: 102us
List of Processors, 2 total:
0 1
List of Effective Processors, 2 total:
0 1
List of Memory Nodes, 1 total:
0
List of Available Memory Nodes, 1 total:
0
Memory Limit: 2.00G
Memory Soft Limit: Unlimited
Memory & Swap Limit: 2.00G
Maximum Processes Limit: Unlimited