protected void configureConnectionLimits(final T builder) {
        if (this.properties.getMaxConnectionIdle() != null) {
            throw new IllegalStateException(
                    "MaxConnectionIdle is set but this implementation does not support maxConnectionIdle!");
        }
        if (this.properties.getMaxConnectionAge() != null) {
            throw new IllegalStateException(
                    "MaxConnectionAge is set but this implementation does not support maxConnectionAge!");
        }
        if (this.properties.getMaxConnectionAgeGrace() != null) {
            throw new IllegalStateException(
                    "MaxConnectionAgeGrace is set but this implementation does not support maxConnectionAgeGrace!");
        }
    }
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