관측성 검증 CI 추가

Author: Neibce

.github/workflows/observability-validation.yml

@@ -0,0 +1,36 @@
+name: Observability Validation
+
+on:
+  pull_request:
+    branches:
+      - develop
+      - main
+    paths:
+      - ".github/workflows/observability-validation.yml"
+      - "backend/**"
+      - "frontend/**"
+      - "kubernetes/**"
+      - "docs/content/developer/infra/observability-*/**"
+  workflow_dispatch:
+
+jobs:
+  validate-observability:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up kubectl
+        uses: azure/setup-kubectl@v4
+
+      - name: Set up Python YAML support
+        run: python3 -m pip install --user PyYAML
+
+      - name: Validate monitoring bundle
+        run: bash kubernetes/monitoring/validate.sh
+
+      - name: Render dev application manifests
+        run: kubectl kustomize kubernetes/overlays/dev >/tmp/codeplace-dev-render.yaml
+
+      - name: Render prod application manifests
+        run: kubectl kustomize kubernetes/overlays/prod >/tmp/codeplace-prod-render.yaml

docs/content/developer/infra/observability-improvement-plan/_index.md

@@ -218,6 +218,8 @@ P1은 `group_wait=30s`, `repeat_interval=1h`로 전달합니다.
   - Loki storage shape check: Monolithic mode, filesystem storage, Longhorn PVC, 50Gi size, dev/prod retention, MinIO disabled.
   - scrape resource shape check: ServiceMonitor/PodMonitor selector label, scrape path/port/interval.
   - Monitoring kustomization shape check: email fallback example이 기본 적용에 섞이지 않는지 확인.
+- GitHub Actions observability validation: `.github/workflows/observability-validation.yml`
+  - PR에서 `kubernetes/**`, 관측성 관련 backend/frontend/docs 변경 시 monitoring bundle validation과 dev/prod kustomize render를 실행합니다.
 - Live cluster smoke check: `bash kubernetes/monitoring/smoke-check.sh`
   - Prometheus Operator CRD, monitoring namespace resource, selector label, webhook Secret, kube-prometheus-stack Pod readiness, optional Loki/Alloy, app namespace backend service/port/readiness를 읽기 전용으로 확인합니다.