protected void configureKeepAlive(final T builder) {
        if (this.properties.isEnableKeepAlive()) {
            throw new IllegalStateException("KeepAlive is enabled but this implementation does not support keepAlive!");
        }
    }
Configures the keep alive options that should be used by the server.

@param builder The server builder to configure.
grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/serverfactory/AbstractGrpcServerFactory.java