FEAT(applications): enable HA with replica 2 and soft anti-affinity

- Add replicaCount: 2 to docusaurus, headlamp, homer, mas, umami
- Add soft pod anti-affinity for node distribution
- Enable high availability across multiple nodes

mas/helm-values.yaml

@@ -12,6 +12,7 @@ serviceAccount:
 
 controllers:
   main:
+    replicaCount: 2
     strategy: RollingUpdate
     rollingUpdate:
       unavailable: 0
@@ -76,6 +77,16 @@ controllers:
                 port: 8000
               initialDelaySeconds: 0
               periodSeconds: 5
+    # Affinity - Soft Anti-Affinity to spread pods across nodes
+    affinity:
+      podAntiAffinity:
+        preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchLabels:
+                  app.kubernetes.io/name: mas
+              topologyKey: kubernetes.io/hostname
 
 service:
   main: