kubernetes - Added New Frontend System filter for tab

Signed-off-by: Andre Wanlin <awanlin@spotify.com>

plugins/kubernetes/src/alpha/entityContents.tsx

@@ -17,6 +17,8 @@
 import React from 'react';
 import { compatWrapper } from '@backstage/core-compat-api';
 import { EntityContentBlueprint } from '@backstage/plugin-catalog-react/alpha';
+import { isKubernetesAvailable } from '../Router';
+import { isKind } from '@backstage/plugin-catalog';
 
 export const entityKubernetesContent = EntityContentBlueprint.make({
   name: 'kubernetes',
@@ -24,7 +26,12 @@ export const entityKubernetesContent = EntityContentBlueprint.make({
     defaultPath: '/kubernetes',
     defaultTitle: 'Kubernetes',
     defaultGroup: 'deployment',
-    filter: 'kind:component,resource',
+    filter: entity => {
+      if (!isKind('Component')) return false;
+      if (!isKind('Resource')) return false;
+      if (!isKubernetesAvailable(entity)) return false;
+      return true;
+    },
     loader: () =>
       import('./KubernetesContentPage').then(m =>
         compatWrapper(<m.KubernetesContentPage />),