v0.8 to v0.9

Due to a change in the API group that cert-manager deployments use (apps/v1beta1 to apps/v1), cert-manager deployments must first be deleted before applying the new version. This will cause downtime until the new version has been applied. No data loss will occur during this operation however it is always advised to backup your data during an upgrade, which you can follow here. To perform this action run:

$ kubectl delete deployments --namespace cert-manager \
    cert-manager \
    cert-manager-cainjector \
    cert-manager-webhook

After this operation, follow the standard upgrade process as defined in the upgrade guide.