doc: remove federation tests in example and some federation content. (#19581)

content/en/docs/tasks/administer-cluster/dns-debugging-resolution.md

@@ -265,15 +265,6 @@ work properly owing to a known issue with Alpine.
 Check [here](https://github.com/kubernetes/kubernetes/issues/30215)
 for more information.
 
-## Kubernetes Federation (Multiple Zone support)
-
-Release 1.3 introduced Cluster Federation support for multi-site Kubernetes
-installations. This required some minor (backward-compatible) changes to the
-way the Kubernetes cluster DNS server processes DNS queries, to facilitate
-the lookup of federated services (which span multiple Kubernetes clusters).
-See the [Cluster Federation Administrators' Guide](/docs/concepts/cluster-administration/federation/)
-for more details on Cluster Federation and multi-site support.
-
 ## References
 
 - [DNS for Services and Pods](/docs/concepts/services-networking/dns-pod-service/)

content/en/examples/examples_test.go

@@ -34,8 +34,6 @@ import (
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
 	"k8s.io/kubernetes/pkg/api/testapi"
-	"k8s.io/kubernetes/pkg/apis/admissionregistration"
-	ar_validation "k8s.io/kubernetes/pkg/apis/admissionregistration/validation"
 	"k8s.io/kubernetes/pkg/apis/apps"
 	apps_validation "k8s.io/kubernetes/pkg/apis/apps/validation"
 	"k8s.io/kubernetes/pkg/apis/autoscaling"
@@ -434,12 +432,6 @@ func TestExampleObjectSchemas(t *testing.T) {
 			"node-problem-detector-configmap": {&apps.DaemonSet{}},
 			"termination":                     {&api.Pod{}},
 		},
-		"federation": {
-			"policy-engine-deployment":    {&apps.Deployment{}},
-			"policy-engine-service":       {&api.Service{}},
-			"replicaset-example-policy":   {&apps.ReplicaSet{}},
-			"scheduling-policy-admission": {&api.ConfigMap{}},
-		},
 		"podpreset": {
 			"allow-db":          {&settings.PodPreset{}},
 			"allow-db-merged":   {&api.Pod{}},
@@ -525,9 +517,9 @@ func TestExampleObjectSchemas(t *testing.T) {
 			"redis":     {&api.Pod{}},
 		},
 		"policy": {
-			"privileged-psp":                                 {&policy.PodSecurityPolicy{}},
-			"restricted-psp":                                 {&policy.PodSecurityPolicy{}},
-			"example-psp":                                    {&policy.PodSecurityPolicy{}},
+			"privileged-psp": {&policy.PodSecurityPolicy{}},
+			"restricted-psp": {&policy.PodSecurityPolicy{}},
+			"example-psp":    {&policy.PodSecurityPolicy{}},
 			"zookeeper-pod-disruption-budget-maxunavailable": {&policy.PodDisruptionBudget{}},
 			"zookeeper-pod-disruption-budget-minunavailable": {&policy.PodDisruptionBudget{}},
 		},

content/en/examples/federation/policy-engine-deployment.yaml

@@ -1,37 +0,0 @@
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  labels:
-    app: opa
-  name: opa
-  namespace: federation-system
-spec:
-  replicas: 1
-  selector:
-    matchLabels:
-      app: opa
-  template:
-    metadata:
-      labels:
-        app: opa
-      name: opa
-    spec:
-      containers:
-        - name: opa
-          image: openpolicyagent/opa:0.4.10
-          args:
-          - "run"
-          - "--server"
-        - name: kube-mgmt
-          image: openpolicyagent/kube-mgmt:0.2
-          args:
-          - "-kubeconfig=/srv/kubernetes/kubeconfig"
-          - "-cluster=federation/v1beta1/clusters"
-          volumeMounts:
-           - name: federation-kubeconfig
-             mountPath: /srv/kubernetes
-             readOnly: true
-      volumes:
-      - name: federation-kubeconfig
-        secret:
-          secretName: federation-controller-manager-kubeconfig

content/en/examples/federation/policy-engine-service.yaml

@@ -1,13 +0,0 @@
-apiVersion: v1
-kind: Service
-metadata:
-  name: opa
-  namespace: federation-system
-spec:
-  selector:
-    app: opa
-  ports:
-  - name: http
-    protocol: TCP
-    port: 8181
-    targetPort: 8181

content/en/examples/federation/replicaset-example-policy.yaml

@@ -1,21 +0,0 @@
-apiVersion: apps/v1
-kind: ReplicaSet
-metadata:
-  labels:
-    app: nginx-pci
-  name: nginx-pci
-  annotations:
-    requires-pci: "true"
-spec:
-  replicas: 3
-  selector:
-    matchLabels:
-      app: nginx-pci
-  template:
-    metadata:
-      labels:
-        app: nginx-pci
-    spec:
-      containers:
-      - image: nginx
-        name: nginx-pci

content/en/examples/federation/scheduling-policy-admission.yaml

@@ -1,29 +0,0 @@
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: admission
-  namespace: federation-system
-data:
-  config.yml: |
-    apiVersion: apiserver.k8s.io/v1alpha1
-    kind: AdmissionConfiguration
-    plugins:
-    - name: SchedulingPolicy
-      path: /etc/kubernetes/admission/scheduling-policy-config.yml
-  scheduling-policy-config.yml: |
-    kubeconfig: /etc/kubernetes/admission/opa-kubeconfig
-  opa-kubeconfig: |
-    clusters:
-      - name: opa-api
-        cluster:
-          server: http://opa.federation-system.svc.cluster.local:8181/v0/data/kubernetes/placement
-    users:
-      - name: scheduling-policy
-        user:
-          token: deadbeefsecret
-    contexts:
-      - name: default
-        context:
-          cluster: opa-api
-          user: scheduling-policy
-    current-context: default