CHORE(repo): switch to emptyDir with sizeLimit

- Add sizeLimit 2Gi to loki emptyDir
- Add sizeLimit 2Gi to tempo emptyDir
- Change prometheus from PVC to emptyDir 5Gi
- Change alertmanager from PVC to emptyDir 500Mi

alertmanager/helm-values.yaml

@@ -16,10 +16,18 @@ affinity:
               app.kubernetes.io/name: alertmanager
           topologyKey: kubernetes.io/hostname
 
+# Use emptyDir instead of PVC (alert state is temporary)
 persistence:
-  enabled: true
-  size: 1Gi
-  storageClass: local-path
+  enabled: false
+
+extraVolumes:
+  - name: storage
+    emptyDir:
+      sizeLimit: 500Mi
+
+extraVolumeMounts:
+  - name: storage
+    mountPath: /alertmanager
 
 resources:
   requests:

loki/helm-values.yaml

@@ -51,7 +51,8 @@ singleBinary:
     enabled: false
   extraVolumes:
     - name: data
-      emptyDir: {}
+      emptyDir:
+        sizeLimit: 2Gi
   extraVolumeMounts:
     - name: data
       mountPath: /var/loki

prometheus/helm-values.yaml

@@ -69,14 +69,10 @@ prometheus:
       image: quay.io/thanos/thanos:v0.37.2
       # objectStorageConfig removed - no upload to MinIO, local storage only
 
+    # Use emptyDir instead of PVC (data is temporary, Thanos handles long-term)
     storageSpec:
-      volumeClaimTemplate:
-        spec:
-          storageClassName: local-path
-          accessModes: ["ReadWriteOnce"]
-          resources:
-            requests:
-              storage: 5Gi
+      emptyDir:
+        sizeLimit: 5Gi
 
     resources:
       requests:

tempo/helm-values.yaml

@@ -90,7 +90,8 @@ persistence:
 # emptyDir volume for WAL
 extraVolumes:
   - name: tempo-data
-    emptyDir: {}
+    emptyDir:
+      sizeLimit: 2Gi
 
 # =============================================================================
 # Service