About
I upgraded the version of Cert-Manger. I left what I did here.
Check Cert-Manager Version
microk8s.kubectl describe deployment cert-manager -n cert-manager | grep Image
Image: quay.io/jetstack/cert-manager-controller:v1.9.1
prompt output
Delete and Update
microk8s.kubectl delete -f https://github.com/jetstack/cert-manager/releases/download/v1.9.1/cert-manager.yaml
microk8s.kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.16.1/cert-manager.yaml
You can see latest cert-manager version in the Github page.