@Override
    public Map<String, ConnectivityState> getConnectivityState() {
        return Collections.unmodifiableMap(this.channelStates);
    }
Configures custom User-Agent for the channel.

@param builder The channel builder to configure.
@param name The name of the client to configure.
grpc-client-spring-boot-starter/src/main/java/net/devh/boot/grpc/client/channelfactory/AbstractChannelFactory.java