Criando um Worker para o MassTransit, definindo a quantidade de consumidores concorrentes

gistfile1.cs

DataBus = ServiceBusFactory.New(x =>
{
    x.ReceiveFrom(ConfigurationManager.AppSettings["SourceQueue"]);
    x.SetPurgeOnStartup(false);
    
    x.UseMsmq();
    x.UseMulticastSubscriptionClient(m => m.SetNetworkKey(ConfigurationManager.AppSettings["NetworkName"]));

    x.SetConcurrentConsumerLimit(4);
    x.UseDistributorFor<DoSimpleWorkItem>();
    x.UseControlBus();
});