monitoring: allow grafana upgrade remediation

services/monitoring/helmrelease.yaml

@@ -245,6 +245,15 @@ spec:
         kind: HelmRepository
         name: grafana
         namespace: flux-system
+  install:
+    remediation: { retries: 3 }
+    timeout: 15m
+  upgrade:
+    remediation:
+      retries: 3
+      remediateLastFailure: true
+    cleanupOnFail: true
+    timeout: 15m
   values:
     admin:
       existingSecret: grafana-admin