We have istio 1.4.3 running in production and staging both in GKE cluster. It was installed using Helm. We have one external LB and one internal LB. Installing both LB using Helm was pretty straightforward.
But, now Helm install method is deprecated. Can anyone tell me what would be the correct way to upgrade to 1.6.0 with minimal or no downtime. Also, we want keep using both the internal and external LB. Help much appreciated.