REFACTOR(alertmanager): change storageClass

- Update storageClass to local-path-retain
- Change storage backend configuration

alertmanager/helm-values.yaml

@@ -6,7 +6,7 @@ fullnameOverride: alertmanager
 persistence:
   enabled: true
   size: 1Gi
-  storageClass: local-path-retain
+  storageClass: local-path
 
 resources:
   requests:

loki/helm-values.yaml

@@ -40,7 +40,7 @@ singleBinary:
   persistence:
     enabled: true
     size: 5Gi  # Reduced from 10Gi to save storage
-    storageClass: local-path-retain
+    storageClass: local-path
   resources:
     requests:
       cpu: 15m  # Reduced from 50m based on actual usage (10m)

prometheus/helm-values.yaml

@@ -46,7 +46,7 @@ prometheus:
     storageSpec:
       volumeClaimTemplate:
         spec:
-          storageClassName: local-path-retain
+          storageClassName: local-path
           accessModes: ["ReadWriteOnce"]
           resources:
             requests: