Disable defaultRules.rules.kubernetesResources

Disable default rules to prevent KubeCPUOvercommit and KubeMemOvercommit
always firing.

Closes: #368

helmfiles/values/prometheus.yaml.gotmpl

@@ -49,6 +49,12 @@ prometheus:
 prometheusOperator:
   createCustomResource: false
 
+defaultRules:
+  rules:
+    # Disable default rules to prevent KubeCPUOvercommit and KubeMemOvercommit
+    # always firing
+    kubernetesResources: false
+
 grafana:
   adminPassword: "{{ requiredEnv "GRAFANA_ADMIN_PASSWORD" }}"