PERF(loki): disable canary to reduce MinIO load

- Disable lokiCanary which queries Loki every second
- Reduces continuous S3 read operations on MinIO

loki/helm-values.yaml

@@ -105,13 +105,9 @@ chunksCache:
 resultsCache:
   enabled: false
 
-# Loki Canary - top level config
+# Loki Canary - disabled to reduce MinIO load
 lokiCanary:
-  enabled: true
-  tolerations:
-    - key: "node-role.kubernetes.io/control-plane"
-      operator: "Exists"
-      effect: "NoSchedule"
+  enabled: false
 
 # Monitoring
 monitoring: