Change default for deploymentApiVersion to `apps/v1` (breaking change)
Proposal
In Auto DevOps, switch default of deploymentApiVersion: extensions/v1beta1 to new default deploymentApiVersion: apps/v1. Switch planned for GitLab %13.0
Impact
If user is using Kubernetes 1.9 and below, they will need to upgrade their Kubernetes cluster in order to get apps/v1. Note in https://docs.gitlab.com/ee/topics/autodevops/#requirements, we require Kubernetes 1.12+
If the user's cluster is Kubernetes 1.9 or below, this breaking change will cause them to an error message like:
unable to find resource of type 'deployment'Impact on GitLab.com
As there should be minimal number of users using Kubernetes 1.9 or below, it should be OK to deploy to GitLab.com whenever this change is ready
Background
In gitlab-org/gitlab#32720 (closed), we added support for changing deploymentApiVersion. The ability to use deploymentApiVersion: apps/v1 has been available since Kubernetes 1.9. Kubernetes 1.16 no longer will be serving extensions/v1beta1 deployments.