add default entity filter to k8s tab

Signed-off-by: Alex McKay <amckay@spotify.com>

plugins/kubernetes/README.md

@@ -52,7 +52,7 @@ export const app = createApp({
 });
 ```
 
-2. Next, enable your desired extensions in `app-config.yaml`
+2. Next, enable your desired extensions in `app-config.yaml`.
 
 ```yaml
 app:
@@ -60,4 +60,14 @@ app:
     - entity-content:kubernetes/kubernetes
 ```
 
-Now, the extension appears on your entity page as one of the tabs, which is called `KUBERNETES`
+Now, the extension appears on your entity page as one of the tabs, which is called `KUBERNETES`.
+By default, the tab will only appear on entities that are Components or Resources. You can override
+that behavior by providing a config block to the extension, like so:
+
+```yaml
+app:
+  extensions:
+    - entity-content:kubernetes/kubernetes:
+        config:
+          filter: kind:component,api,resource,system
+```

plugins/kubernetes/src/alpha/entityContents.tsx

@@ -23,6 +23,7 @@ export const entityKubernetesContent = EntityContentBlueprint.make({
   params: {
     defaultPath: '/kubernetes',
     defaultTitle: 'Kubernetes',
+    filter: 'kind:component,resource',
     loader: () =>
       import('./KubernetesContentPage').then(m =>
         compatWrapper(<m.KubernetesContentPage />),