GRPC requires http2 which is only supported by ALB and not ELB. Our services are mostly GRPC so lack of ALB means we can't use k8s out of ths box on AWS if that adds any fuel to the fire.
I also want GRPC for my own stuff; ELB will work fine (in TCP mode), but I also want it to work through ingress. My understanding is HTTP2/GRPC support is coming to ingress - that aledbf has already implemented it, and it will be coming to the "official" repo soon; ingress is becoming a top-level project and there's some reshuffling that has to happen, but then aledbf has some great stuff in the pipeline.
As a heavy grpc user, I don't think ALB supports it due to a lack of trailer support. You're probably going to just use a TCP load balancer if you want grpc services behind a load balancer.
