title: What are the use cases of identifying process id of a log message?
body: <p>I'm researching node.js logging tools. The top 2 ones seem to be Winston and Bunyan. In the comparison article, it's mentioned how to get the process id.</p>
  
  <p>What is the use case of knowing this process ID? When is it useful?</p>
  
  <p>I mainly develop web apps.</p>