Use updated config to specify PubSub channel for Brokers

config/400-config-br-default-channel.yaml

@@ -0,0 +1 @@
+core/configmaps/config-br-default-channel.yaml

config/core/configmaps/config-br-default-channel.yaml

@@ -0,0 +1,23 @@
+# Copyright 2020 The Knative Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: config-br-default-channel
+  namespace: cloud-run-events
+data:
+  channelTemplateSpec: |
+    apiVersion: messaging.cloud.google.com/v1alpha1
+    kind: Channel

docs/install/install-broker-with-pubsub-channel.md

@@ -17,12 +17,12 @@ Channel.
 
 1.  Patch the configmap in the `knative-eventing` namespace to use the Pub/Sub
     `Channel` as the
-    [default channel](https://knative.dev/docs/eventing/channels/default-channels/)
-    with
-    [patch-default-ch-config-with-pubsub.yaml](./patch-default-ch-config-with-pubsub.yaml).
+    [default channel](https://knative.dev/docs/eventing/channel-based-broker/)
+    for Brokers with
+    [patch-config-br-defaults-with-pubsub.yaml](./patch-config-br-defaults-with-pubsub.yaml).
 
     ```shell
-    kubectl patch configmap default-ch-webhook -n knative-eventing --patch "$(cat patch-default-ch-config-with-pubsub.yaml)"
+    kubectl patch configmap config-br-defaults -n knative-eventing --patch "$(cat patch-config-br-defaults-with-pubsub.yaml)"
     ```
 
 1.  Add the `knative-eventing-injection` label to your namespace with the

docs/install/patch-config-br-defaults-with-pubsub.yaml

@@ -0,0 +1,22 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+data:
+  # Configuration for defaulting channels that do not specify CRD implementations.
+  default-br-config: |
+    clusterDefault:
+      apiVersion: v1
+      kind: ConfigMap
+      name: config-br-default-channel
+      namespace: cloud-run-events