logging: schedule OpenSearch with realistic memory and fallback

services/logging/opensearch-helmrelease.yaml

@@ -71,8 +71,8 @@ spec:
     opensearchJavaOpts: "-Xms2g -Xmx2g"
     resources:
       requests:
-        cpu: "25m"
-        memory: "768Mi"
+        cpu: "500m"
+        memory: "3Gi"
       limits:
         cpu: "2"
         memory: "4Gi"
@@ -89,8 +89,6 @@ spec:
         node.store.allow_mmap: false
     nodeSelector:
       node-role.kubernetes.io/worker: "true"
-      hardware: rpi5
-      kubernetes.io/hostname: titan-05
     affinity:
       nodeAffinity:
         requiredDuringSchedulingIgnoredDuringExecution:
@@ -100,5 +98,24 @@ spec:
                   operator: In
                   values:
                     - rpi5
+                    - rpi4
+            - matchExpressions:
+                - key: kubernetes.io/hostname
+                  operator: In
+                  values: [titan-22]
+        # Pi workers first; Titan-22 is the explicit last-resort CPU host.
+        preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            preference:
+              matchExpressions:
+                - key: hardware
+                  operator: In
+                  values: [rpi5]
+          - weight: 50
+            preference:
+              matchExpressions:
+                - key: hardware
+                  operator: In
+                  values: [rpi4]
     sysctlInit:
       enabled: true