Thanks for a great post! It was super detailed and I loved reading it. I had a quick question about your pg setup. You mentioned that you use EBS for your persistence storage, which is locked by zone . You can't have an EC2 instance in Zone 1 mount a storage in Zone 3. Does this cause issues with your db? Especially as you have HPA and ClusterAutoscaler, your k8s nodes could be spun up in Zone 1 for pg autoscaling but your data is in Zone 3.
