title: get notifications when kafka producer is online or offline
body: <p>I'm building a website using springboot as RestAPI and angular in frontend. Also, i will be getting data in  my rest(consumer) from around 40-50 swing standalone apps(producers) through kafka. I need to implement online status for those swing apps. Basically, i need to know when and which one of swing apps went offline or back online. Is there a way to implement this? If this is impossible with kafka can you recommend something else for communication?</p>
  <p>Clarification:
  By online status i mean whether device on which swing app is installed has internet connection or not.
  Swing app will be installed on around 40-50 devices on remote locations.</p>