Enhance monitoring configurations by enabling persistence for Loki and updating storage settings for Prometheus and Alertmanager to use Longhorn. Add Longhorn application to kustomization.yaml for improved storage management.

clusters/noble/apps/monitoring-kube-prometheus/application.yaml

@@ -4,7 +4,7 @@ metadata:
   name: monitoring-kube-prometheus
   namespace: argocd
   annotations:
-    argocd.argoproj.io/sync-wave: "1"
+    argocd.argoproj.io/sync-wave: "2"
 spec:
   project: default
   destination:
@@ -20,12 +20,26 @@ spec:
             prometheusSpec:
               retention: 15d
               storageSpec:
-                emptyDir: {}
+                volumeClaimTemplate:
+                  spec:
+                    storageClassName: longhorn
+                    accessModes:
+                      - ReadWriteOnce
+                    resources:
+                      requests:
+                        storage: 20Gi
           alertmanager:
             alertmanagerSpec:
               retention: 120h
               storage:
-                emptyDir: {}
+                volumeClaimTemplate:
+                  spec:
+                    storageClassName: longhorn
+                    accessModes:
+                      - ReadWriteOnce
+                    resources:
+                      requests:
+                        storage: 5Gi
           kubeEtcd:
             enabled: false
           kubeScheduler: