FEAT(loki): enable loki-canary with control-plane toleration

- Enable lokiCanary for log ingestion monitoring
- Add toleration for control-plane node

loki/helm-values.yaml

@@ -102,7 +102,11 @@ monitoring:
     grafanaAgent:
       installOperator: false
   lokiCanary:
-    enabled: false
+    enabled: true
+    tolerations:
+      - key: "node-role.kubernetes.io/control-plane"
+        operator: "Exists"
+        effect: "NoSchedule"
   serviceMonitor:
     enabled: true
     interval: 60s