feat(grafana): added basic persistence for grafana

template/stacks/observability/victoria-k8s-stack/values.yaml

@@ -773,9 +773,9 @@ vmauth:
       discover_backend_ips: true
       url_map:
         - src_paths:
-            - '{{ .vm.read.path }}/.*'
+            - /.*
           url_prefix:
-            - '{{ urlJoin (omit .vm.read "path") }}/'
+            - 'http://vlogs-victorialogs:9428'
         - src_paths:
             - '{{ .vm.write.path }}/.*'
           url_prefix:
@@ -882,6 +882,10 @@ defaultDatasources:
 grafana:
   enabled: true
   # all values for grafana helm chart can be specified here
+  persistence:
+    enabled: true
+    type: pvc
+    storageClassName: "default"
   sidecar:
     datasources:
       enabled: true