Simple .NET producer example

Review this example code to learn how you can create a simple .NET producer. This producer is capable of producing around 36000 messages every second in development environment.

internal class Program
{
    private static int _inFlight;
    private static long _delivered;

    private static void HandleDeliveryResult(int msgid, DeliveryResult<string, string> deliveryResult)
    {
        if (msgid % 1024 == 0)  // writing to console on every message would be a bottleneck
        {
            Console.WriteLine($"Delivered '{deliveryResult.Value}' to '{deliveryResult.TopicPartitionOffset}', in flight on delivery confirmation: {_inFlight}");
        }
        --_inFlight;
        ++_delivered;
    }

    private static void Main(string[] args)
    {
        using var producer = new ProducerBuilder<string, string>(new ProducerConfig { BootstrapServers = "broker:9092" }).Build();
        int msgCounter = 0;
        var start = DateTime.Now;
        while (!(Console.KeyAvailable && Console.ReadKey().Key == ConsoleKey.Q || (DateTime.Now - start).TotalSeconds >= 60))
        {
            int msgid = ++msgCounter;
            try
            {
                producer.Produce("topic", new Message<string, string> { Key = msgid.ToString(), Value = $"{msgid}, in flight on send: {++_inFlight}" },
                    result => HandleDeliveryResult(msgid, result));
            }
            catch (ProduceException<string, string> e)
            {
                Console.WriteLine($"Produce failed: {e.Error.Reason}");
            }
        }
        producer.Flush();
        Console.WriteLine("average throughput: {0:N3} msg/sec", _delivered / (DateTime.Now - start).TotalSeconds);
    }
}