Use apps/v1 API group whenever possible (#8055)

The use of extensions/v1beta1, apps/v1beta1 and apps/v1beta2 API
groups should be discouraged.

Closes: #8049

docs/tasks/debug-application-cluster/debug-service.md

@@ -78,13 +78,14 @@ Note that this is the same as if you had started the `Deployment` with
 the following YAML:
 
 ```yaml
-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: hostnames
 spec:
   selector:
-    app: hostnames
+    matchLabels:
+      app: hostnames
   replicas: 3
   template:
     metadata:

docs/tasks/debug-application-cluster/fluentd-gcp-ds.yaml

@@ -1,4 +1,4 @@
-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: DaemonSet
 metadata:
   name: fluentd-gcp-v2.0
@@ -8,6 +8,11 @@ metadata:
     addonmanager.kubernetes.io/mode: Reconcile
     version: v2.0
 spec:
+  selector:
+    matchLabels:
+      k8s-app: fluentd-gcp
+      kubernetes.io/cluster-service: "true"
+      version: v2.0
   updateStrategy:
     type: RollingUpdate
   template: