i'm working on getting spicedb set up in AWS infra. it seems like gRPC is designed to be aware of all downstream servers and do its own load balancing either according to xDS or to a [service config](https://github.com/grpc/grpc/blob/master/doc/service_config.md). does spiceDB implement one or both of those? in the meantime we could throw an NLB between the client and spicedb, but that seems like it foregoes the benefit of per-RPC load balancing.