diff --git a/cluster/manifests/freeleaps-monitoring-system/kube-prometheus-stack/values.yaml b/cluster/manifests/freeleaps-monitoring-system/kube-prometheus-stack/values.yaml
index bc20c13f..5b95aca2 100644
--- a/cluster/manifests/freeleaps-monitoring-system/kube-prometheus-stack/values.yaml
+++ b/cluster/manifests/freeleaps-monitoring-system/kube-prometheus-stack/values.yaml
@@ -2663,9 +2663,10 @@ prometheusOperator:
         duration: ""  # default to be 5y
       admissionCert:
         duration: ""  # default to be 1y
-      issuerRef:
-        name: "mathmast-dot-com"
-        kind: "ClusterIssuer"
+      # Selfsigned, do not ref any issuer @ Sun Zhenyu
+      # issuerRef:
+      #  name: "mathmast-dot-com"
+      #  kind: "ClusterIssuer"
 
   ## Namespaces to scope the interaction of the Prometheus Operator and the apiserver (allow list).
   ## This is mutually exclusive with denyNamespaces. Setting this to an empty object will disable the configuration