#Certificate Monitoring

Cluster Enhancer provides monitoring capabilities for certificates used in Kubernetes clusters. The monitoring scope includes:

1. Kubernetes component certificates, including control plane and kubelet server/client certificates (including kubeconfig client certificates)
2. Certificates of components running in the cluster, implemented by inspecting all Secrets with type kubernetes.io/tls
3. Server certificates actually used by kube-apiserver (including internal loopback certificates for self-access) by accessing the kubernetes Endpoints

Users can find and install Cluster Enhancer in the Administrator view by navigating to Marketplace > Cluster Plugins in the left navigation.

#Certificate Status Monitoring

The expiration status of certificates can be viewed through the metric certificate_expires_status. The expiration time of certificates can be viewed through the metric certificate_expires_time.

The current certificate status and expiration time can be viewed in the Certificate Status sub-tab. To access this sub-tab, go to the Administrator view, navigate to Clusters > Clusters, select a specific cluster, then go to the Monitoring tab.

#Built-in Alert Rules

Cluster Enhancer provides built-in alert rules cpaas-certificates-rule with the following alerts:

#Kubernetes Certificate Alerts

Rule	Level
The expiration time of the kubernetes certificate is about to expire (less than 30 days) <= 30d and last 1 minutes	Medium
The expiration time of the kubernetes certificate is about to expire (less than 10 days) <= 10d and last 1 minutes	High
Kubernetes certificate has expired <= 0d and last 1 minutes	Critical

#Platform Components Certificate Alerts

Rule	Level
The expiration time of the platform components certificate is about to expire (less than 30 days) <= 30d and last 1 minutes	Medium
The expiration time of the platform components certificate is about to expire (less than 10 days) <= 10d and last 1 minutes	High
Platform components certificate has expired <= 0d and last 1 minutes	Critical