REFACTOR(thanos): remove S3 storage integration

- Disable Store Gateway and Compactor
- Remove Sidecar objectStorageConfig
- Keep Thanos Query + Sidecar for HA query
- 3-day local retention is sufficient

prometheus/helm-values.yaml

@@ -62,15 +62,12 @@ prometheus:
 
     scrapeInterval: 60s       # 30s → 60s (메모리 절감)
     evaluationInterval: 60s   # 30s → 60s
-    retention: 3d             # Local retention (S3 has longer retention via Thanos)
+    retention: 3d             # Local retention only (no S3 upload)
 
-    # Thanos Sidecar configuration
+    # Thanos Sidecar configuration (query only, no S3 upload)
     thanos:
       image: quay.io/thanos/thanos:v0.37.2
-      objectStorageConfig:
-        existingSecret:
-          name: thanos-objstore-secret
-          key: objstore.yml
+      # objectStorageConfig removed - no upload to MinIO, local storage only
 
     storageSpec:
       volumeClaimTemplate:

thanos/helm-values.yaml

@@ -65,62 +65,16 @@ queryFrontend:
   enabled: false
 
 # =============================================================================
-# Store Gateway - Reads historical data from S3
+# Store Gateway - Reads historical data from S3 (DISABLED - using local storage only)
 # =============================================================================
 storegateway:
-  enabled: true
-  replicaCount: 1
-
-  # Run on master node for stability
-  tolerations:
-    - key: node-role.kubernetes.io/control-plane
-      operator: Exists
-      effect: NoSchedule
-  nodeSelector:
-    node-role.kubernetes.io/control-plane: "true"
-
-  resources:
-    requests:
-      cpu: 15m
-      memory: 128Mi
-    limits:
-      memory: 128Mi
-
-  persistence:
-    enabled: true
-    storageClass: local-path
-    size: 2Gi
+  enabled: false
 
 # =============================================================================
-# Compactor - Compacts and downsamples data in S3
+# Compactor - Compacts and downsamples data in S3 (DISABLED - using local storage only)
 # =============================================================================
 compactor:
-  enabled: true
-
-  # Run on master node for stability
-  tolerations:
-    - key: node-role.kubernetes.io/control-plane
-      operator: Exists
-      effect: NoSchedule
-  nodeSelector:
-    node-role.kubernetes.io/control-plane: "true"
-
-  # Retention settings
-  retentionResolutionRaw: 7d      # Keep raw data for 7 days
-  retentionResolution5m: 30d      # Keep 5m downsampled for 30 days
-  retentionResolution1h: 90d      # Keep 1h downsampled for 90 days
-
-  resources:
-    requests:
-      cpu: 15m
-      memory: 256Mi
-    limits:
-      memory: 256Mi
-
-  persistence:
-    enabled: true
-    storageClass: local-path
-    size: 2Gi
+  enabled: false
 
 # =============================================================================
 # Ruler - Alerting rules evaluation (disabled, using Prometheus rules)