title: AWS EC2 instance reboot loses all CPU credits
body: <p>Recently I was required to reboot my EC2 instance due to an AWS maintenance alert. After reboot I noticed my CPU credit balance was consumed. Why is that? What's going on?</p>
  
  <p><a href="https://i.stack.imgur.com/Auq0X.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/Auq0X.jpg" alt="EC2 instance CPU usage &amp; credit balance"></a></p>