Add check for Kubernetes annotation on entity

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

.changeset/smart-cooks-drop.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-kubernetes': patch
+---
+
+Added a check for the Kubernetes annotation on the entity

plugins/kubernetes/src/Router.tsx

@@ -27,6 +27,12 @@ const KUBERNETES_ANNOTATION = 'backstage.io/kubernetes-id';
 const KUBERNETES_LABEL_SELECTOR_QUERY_ANNOTATION =
   'backstage.io/kubernetes-label-selector';
 
+export const isKubernetesAvailable = (entity: Entity) =>
+  Boolean(entity.metadata.annotations?.[KUBERNETES_ANNOTATION]) ||
+  Boolean(
+    entity.metadata.annotations?.[KUBERNETES_LABEL_SELECTOR_QUERY_ANNOTATION],
+  );
+
 type Props = {
   /** @deprecated The entity is now grabbed from context instead */
   entity?: Entity;

plugins/kubernetes/src/index.ts

@@ -25,6 +25,6 @@ export {
   kubernetesPlugin as plugin,
   EntityKubernetesContent,
 } from './plugin';
-export { Router } from './Router';
+export { Router, isKubernetesAvailable } from './Router';
 export * from './kubernetes-auth-provider';
 export * from './utils/clusterLinks';