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

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
2026-09-11 17:12:10 +00:00
parent 644da9e65e
commit a065696478
72 changed files with 28415 additions and 2 deletions
@@ -0,0 +1,75 @@
+# Minimal Prometheus: scrapes every pod labelled app=orders on /actuator/prometheus every 5 s and
+# keeps the namespace and pod as labels - prometheus-adapter needs both to map a series to a pod.
+apiVersion: v1
+kind: Namespace
+metadata: {name: monitoring}
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata: {name: prometheus, namespace: monitoring}
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata: {name: prometheus-sd}
+rules:
+  - apiGroups: [""]
+    resources: [pods, endpoints, services]
+    verbs: [get, list, watch]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata: {name: prometheus-sd}
+roleRef: {apiGroup: rbac.authorization.k8s.io, kind: ClusterRole, name: prometheus-sd}
+subjects: [{kind: ServiceAccount, name: prometheus, namespace: monitoring}]
+---
+apiVersion: v1
+kind: ConfigMap
+metadata: {name: prometheus, namespace: monitoring}
+data:
+  prometheus.yml: |
+    global:
+      scrape_interval: 5s
+    scrape_configs:
+      - job_name: orders
+        metrics_path: /actuator/prometheus
+        kubernetes_sd_configs:
+          - role: pod
+            namespaces: {names: [demo]}
+        relabel_configs:
+          - source_labels: [__meta_kubernetes_pod_label_app]
+            regex: orders
+            action: keep
+          - source_labels: [__meta_kubernetes_pod_container_port_number]
+            regex: "8080"
+            action: keep
+          - source_labels: [__meta_kubernetes_namespace]
+            target_label: namespace
+          - source_labels: [__meta_kubernetes_pod_name]
+            target_label: pod
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata: {name: prometheus, namespace: monitoring}
+spec:
+  replicas: 1
+  selector: {matchLabels: {app: prometheus}}
+  template:
+    metadata: {labels: {app: prometheus}}
+    spec:
+      serviceAccountName: prometheus
+      containers:
+        - name: prometheus
+          image: quay.io/prometheus/prometheus:v3.14.0
+          imagePullPolicy: Never
+          args: ["--config.file=/etc/prometheus/prometheus.yml", "--storage.tsdb.retention.time=2h"]
+          ports: [{containerPort: 9090}]
+          resources: {requests: {cpu: 50m, memory: 128Mi}, limits: {memory: 512Mi}}
+          volumeMounts: [{name: config, mountPath: /etc/prometheus}]
+      volumes: [{name: config, configMap: {name: prometheus}}]
+---
+apiVersion: v1
+kind: Service
+metadata: {name: prometheus, namespace: monitoring}
+spec:
+  selector: {app: prometheus}
+  ports: [{port: 9090, targetPort: 9090}]