title: Rabbit mq detect there is no producer in consumers code
body: <p>I have a rabbitmq setup with a producer and many consumers.</p>
  
  <p>What would the best practice way to tell the consumers that the producer isn't able to send due to crash or some other failure? </p>
  
  <p>In case of a failure in the producer I'd like to notify and show a fitting message to all consumers.</p>