Add VictoriaMetrics observability stack + sync catalog for monitoring test

- VM stack 10 charts: victoria-metrics-cluster/auth, victoria-logs-cluster,
  victoria-metrics-agent/alert, opentelemetry-collector, kube-state-metrics,
  prometheus-node-exporter, alertmanager, perses (JWT/OIDC, Infisical-ready)
- ArgoCD ApplicationSet (syncWave) + per-chart dip-values overlays
- doc/victoria-metrics-architecture.md, define-chart-resources updates
- includes pending working-tree changes (mlflow, kubeflow, apisix, CLAUDE.md)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

manifests/helm/opentelemetry-collector/0.156.2/custom-values-events.yaml

@@ -0,0 +1,67 @@
+# =============================================================================
+# OpenTelemetry Collector (Deployment) — K8s 이벤트 수집
+# 차트: open-telemetry/opentelemetry-collector
+# 배포: Deployment (단일 인스턴스 — 이벤트 중복 방지)
+# 릴리스명: otelcol-events
+#
+# 파이프라인: k8sobjects(events) → VictoriaLogs (vlinsert AccountID 0)
+#
+# 설치:
+#   helm install otelcol-events open-telemetry/opentelemetry-collector \
+#     -f custom-values-events.yaml -n monitoring
+# =============================================================================
+
+mode: deployment
+replicaCount: 1
+
+image:
+  repository: otel/opentelemetry-collector-contrib
+
+resources:
+  requests:
+    cpu: 10m
+    memory: 64Mi
+  limits:
+    cpu: 100m
+    memory: 128Mi
+
+config:
+  receivers:
+    k8sobjects:
+      objects:
+        - name: events
+          mode: watch
+          group: ""
+
+  processors:
+    memory_limiter:
+      check_interval: 5s
+      limit_percentage: 80
+      spike_limit_percentage: 25
+    batch:
+      send_batch_size: 1000
+      timeout: 10s
+
+  exporters:
+    # 클러스터 vlinsert로 전송 (platform AccountID 0)
+    otlphttp/vlogs:
+      endpoint: "http://vlogs-victoria-logs-cluster-vlinsert.monitoring.svc.cluster.local:9481/insert/opentelemetry"
+      tls:
+        insecure: true
+      headers:
+        VictoriaLogs-AccountID: "0"
+
+  service:
+    pipelines:
+      logs:
+        receivers: [k8sobjects]
+        processors: [memory_limiter, batch]
+        exporters: [otlphttp/vlogs]
+
+# k8sobjects(events) 접근용 RBAC
+clusterRole:
+  create: true
+  rules:
+    - apiGroups: [""]
+      resources: [events]
+      verbs: [get, list, watch]