title: GCP Ingress backend unhealthy
body: <p>I have a gcp cluster with api services and I was using ambassador 1.9 for edge routing. Now we have decided to upgrade the ambassador to 2.3.2. So I follow the steps in ambassador docs for upgradation by parallelly running both ambassador versions. But after the process is finished the backend service is unhealthy, making the ingress down.</p>
  <ol>
  <li>Multiple deployments with corresponding services.</li>
  <li>Ambassador Edge Stack as API gateway</li>
  <li>Ingress for exposing the edge stack service</li>
  </ol>
  <p>I'm a beginner in both ambassador and stackoverflow, so please let me know if more details are needed.</p>