I'm working on reducing a $50K per month bill for Inter-AZ traffic at the moment. > but multi-az is prohibitively expensive if you need to run anything data he

I'm working on reducing a $50K per month bill for Inter-AZ traffic at the moment. > but multi-az is prohibitively expensive if you need to run anything data heavy distributed. If you communicate between your AZs via ALBs, multi-az is effectively free. Our bill is so high because within our Kubernetes cluster, our mesh isn't locality aware; it randomly routes to any available pod. 2/3rds of our traffic crosses AZs.