Ubuntu 21.04
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MicroK8s : Enable Prometheus
Enable Prometheus add-on to monitor metrics on MicroK8s Cluster.
[1] Enable built-in Prometheus add-on on primary Node.
microk8s enable prometheus dashboard dns

Adding argument --authentication-token-webhook to nodes.
Adding argument --authentication-token-webhook to nodes.
Restarting nodes.
Restarting nodes.
servicemonitor.monitoring.coreos.com/coredns created
servicemonitor.monitoring.coreos.com/kube-controller-manager created
servicemonitor.monitoring.coreos.com/kube-scheduler created
servicemonitor.monitoring.coreos.com/kubelet created
The Prometheus operator is enabled (user/pass: admin/admin)
Addon dashboard is already enabled.
Addon dns is already enabled.

microk8s kubectl get services -n monitoring

NAME                    TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
prometheus-operator     ClusterIP   None             <none>        8443/TCP                     2m25s
alertmanager-main       ClusterIP   <none>        9093/TCP                     2m21s
grafana                 ClusterIP   <none>        3000/TCP                     2m21s
kube-state-metrics      ClusterIP   None             <none>        8443/TCP,9443/TCP            2m20s
node-exporter           ClusterIP   None             <none>        9100/TCP                     2m20s
prometheus-adapter      ClusterIP    <none>        443/TCP                      2m20s
prometheus-k8s          ClusterIP   <none>        9090/TCP                     2m20s
alertmanager-operated   ClusterIP   None             <none>        9093/TCP,9094/TCP,9094/UDP   64s
prometheus-operated     ClusterIP   None             <none>        9090/TCP                     64s

microk8s kubectl get pods -n monitoring

NAME                                  READY   STATUS    RESTARTS   AGE
node-exporter-8k82h                   2/2     Running   0          3m2s
kube-state-metrics-54d8bdf4db-sljxk   3/3     Running   0          3m2s
grafana-7c9bc466d8-mxhbt              1/1     Running   0          3m2s
prometheus-adapter-557648f58c-glj7n   1/1     Running   0          3m3s
prometheus-operator-58fc7fbbd-v8r22   2/2     Running   0          3m7s
alertmanager-main-0                   2/2     Running   0          107s
prometheus-k8s-0                      3/3     Running   1          107s

# set port-forwarding to enable external access

# Prometheus UI

microk8s kubectl port-forward -n monitoring service/prometheus-k8s --address 9090:9090

Forwarding from -> 9090
# Grafana UI

microk8s kubectl port-forward -n monitoring service/grafana --address 3000:3000

Forwarding from -> 3000
[2] Access to [https://(MicroK8s primary node's Hostname or IP address):(setting port)] with an web browser on a Client computer in local network. Then, that's OK if following Prometheus or Grafana UI is shown.
For default user/password on Grafana, it [admin/admin].
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