Go gRPC server returns HTTP/2 GOAWAY under high concurrent RPCs — client sees stream resets
## Environment Go 1.20 gRPC server (google.golang.org/grpc v1.55), running on Debian 12 VMs behind AWS NLB; clients are varied (Go, Java) making 1000+ concurrent unary RPCs per second to the same server instance. ## Symptoms Clients intermittently...