INIT(repo): monitoring stack setup

alertmanager/argocd/alertmanager.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: alertmanager
+  namespace: argocd
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+
+  sources:
+    # Helm chart from external repository
+    - repoURL: https://prometheus-community.github.io/helm-charts
+      chart: alertmanager
+      targetRevision: 1.29.0
+      helm:
+        valueFiles:
+          - $values/alertmanager/helm-values/alertmanager.yaml
+    # Values file from Git repository
+    - repoURL: https://gitea0213.kro.kr/bluemayne/infrastructure.git
+      targetRevision: main
+      ref: values
+
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: monitoring
+
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+      allowEmpty: false
+
+    syncOptions:
+      - CreateNamespace=true
+      - PrunePropagationPolicy=foreground
+      - PruneLast=true
+
+    retry:
+      limit: 5
+      backoff:
+        duration: 5s
+        factor: 2
+        maxDuration: 3m
+
+  revisionHistoryLimit: 10

alertmanager/helm-values/alertmanager.yaml

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+# Alertmanager Helm Values
+# Chart: https://github.com/prometheus-community/helm-charts/tree/main/charts/alertmanager
+
+fullnameOverride: alertmanager
+
+persistence:
+  enabled: true
+  size: 1Gi
+  storageClass: local-path
+
+resources:
+  requests:
+    cpu: 10m
+    memory: 32Mi
+
+# Prometheus ServiceMonitor 설정
+serviceMonitor:
+  enabled: true
+  additionalLabels:
+    release: prometheus
+  namespace: monitoring
+
+config:
+  global:
+    resolve_timeout: 5m
+  route:
+    group_by: ["alertname", "cluster", "service"]
+    group_wait: 10s
+    group_interval: 10s
+    repeat_interval: 12h
+    receiver: "default"
+    routes:
+    - match:
+        severity: critical
+      receiver: "critical"
+      continue: true
+    - match:
+        severity: warning
+      receiver: "warning"
+  receivers:
+  - name: "default"
+    # 기본 수신자 (로그만 남김)
+  - name: "critical"
+    # TODO: Slack, Email 등 알림 채널 추가
+    # webhook_configs:
+    # - url: 'http://your-webhook-url'
+  - name: "warning"
+    # TODO: 경고 알림 채널 추가
+  inhibit_rules:
+  - source_match:
+      severity: "critical"
+    target_match:
+      severity: "warning"
+    equal: ["alertname", "cluster", "service"]

alertmanager/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  # ArgoCD Application 리소스는 infrastructure/kustomization.yaml에서 관리
+  # - argocd/alertmanager.yaml