OpenShift 4.7 で Using non-groupfied API resources is deprecated and will be removed in a future release

現象

既存のyamlをOpenShift4.7で利用したところ、

Using non-groupfied API resources is deprecated and will be removed in a future release, update apiVersion to "xxx/v1" for your resource

というWarning。リソースは問題なく作成されますが。
以下はImageStreamの例ですが、BuildConfig、DeploymentConfigも同様に。

$ oc create -f lab02-is.yaml
W0524 02:13:07.418890     744 shim_kubectl.go:55] Using non-groupfied API resources is deprecated and will be removed in a future release, update apiVersion to "image.openshift.io/v1" for your resource
imagestream.image.openshift.io/ocsample-lab02-is created
$ 

OCP 4.7 Deprecated features

リリースノートにありました
https://docs.openshift.com/container-platform/4.7/release_notes/ocp-4-7-release-notes.html#ocp-4-7-apiversion-v1

Currently, oc fixes apiVersion in YAML or JSON resource files OpenShift Container Platform resources from v1 to the correct value for the object. For example, v1 is corrected to apps.openshift.io/v1 for DeploymentConfig objects. This behavior is deprecated and is planned for removal in a future release, and every resource that includes *.openshift.io must match the apiVersion value found in the API index.

#修正
各yamlで以下のように修正することで、Warningなくなりました

	修正前	修正後
ImageStream	apiVersion: v1	apiVersion: image.openshift.io/v1
BuildConfig	apiVersion: v1	apiVersion: build.openshift.io/v1
DeploymentConfig	apiVersion: v1	apiVersion: apps.openshift.io/v1

現状ocコマンドがapiVersion: v1をapiVersion: image.openshift.io/v1などに適宜変換してくれますが、将来的に変換機能はなくなりますよ、ということで、前述 API index にある「API group」の値を指定してやりましょう、ということでした。