title: Easily detect deprecated resources on Kubernetes
body: <p>We've just received an e-mail from GCP informing us that our clusters are currently using deprecated Beta APIs and that we need to upgrade to the newest API version.</p>
  <p>We have 3 clusters running multiple resources in multiple namespaces so it would be a bit painful having to go through all of them detecting which ones are obsolete.</p>
  <p>The ones we control such as services, deployments, horizontalpodautoscalers, poddisruptionbudgets etc, those ones are already updated.</p>
  <p>But we have many services whose manifest files are automatically generated such as Spinnaker services generated by Halyard, or ElasticSearch generated by Elastic Operator, etc.</p>
  <p>Is there any way to filter all resources by the API version, or any way to detect deprecated resources across all namespaces?</p>