monitoring(grafana): avoid fragile placement and init pull

services/monitoring/helmrelease.yaml

@@ -327,6 +327,8 @@ spec:
       enabled: true
       size: 20Gi
       storageClassName: astreae
+    initChownData:
+      enabled: false
     resources:
       requests:
         cpu: 250m
@@ -361,7 +363,10 @@ spec:
                   operator: In
                   values:
                     - rpi5
-                    - rpi4
+                - key: kubernetes.io/hostname
+                  operator: NotIn
+                  values:
+                    - titan-08
         preferredDuringSchedulingIgnoredDuringExecution:
           - weight: 100
             preference: