message: add link to k8s docs on Missing Annotation page
diff: @@ -21,6 +21,7 @@ import { Route, Routes } from 'react-router-dom';
  import { rootCatalogKubernetesRouteRef } from './plugin';
  import { KubernetesContent } from './components/KubernetesContent';
  import { MissingAnnotationEmptyState } from '@backstage/core';
  +import { Button } from '@material-ui/core';
  const KUBERNETES_ANNOTATION = 'backstage.io/kubernetes-id';
  const KUBERNETES_LABEL_SELECTOR_QUERY_ANNOTATION =
  @@ -54,5 +55,20 @@ export const Router = (_props: Props) => {
  );
  }
  - return <MissingAnnotationEmptyState annotation={KUBERNETES_ANNOTATION} />;
  + return (
  + <>
  + <MissingAnnotationEmptyState annotation={KUBERNETES_ANNOTATION} />
  + <h1>
  + Or use a label selector query, which takes precedence over the previous
  + annotation.
  + </h1>
  + <Button
  + variant="contained"
  + color="primary"
  + href="https://backstage.io/docs/features/kubernetes/configuration#surfacing-your-kubernetes-components-as-part-of-an-entity"
  + >
  + Read Kubernetes Plugin Docs
  + </Button>
  + </>
  + );
  };
  