chore(grafana): Adjusting the number of replicas to support high availability (#109)

Author: EamonZhang

addons/grafana/10/chart/grafana/values.yaml

@@ -269,7 +269,7 @@ notifiers:
 grafana:
   ## @param grafana.replicaCount Number of Grafana nodes
   ##
-  replicaCount: 1
+  replicaCount: 2
   ## @param grafana.updateStrategy.type Set up update strategy for Grafana installation.
   ## Set to Recreate if you use persistent volume that cannot be mounted by more than one pods to make sure the pods is destroyed first.
   ## ref: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#strategy