title: How can I timestamp messages in nifi?
body: <p>Disclaimer: I know absolutely nothing about nifi.</p>
  
  <p>I need to receive messages from the <code>ListenHTTP</code> processor, and then convert each message into a timestamped json message.</p>
  
  <p>So, say I receive the message <code>hello world</code> at 5 am. It should transform it into <code>{"timestamp": "5 am", "message":"hello world"}</code>. </p>
  
  <p>How do I do that?</p>