title: Some charts stopped working in instance group monitoring after installing Ops Agent in Google Cloud
body: <p>I have installed the new Ops Agent in a fleet of servers that are part of a managed instance group.</p>
  <p>Since I did the update, some graphs stopped working in the &quot;Monitoring&quot; tab of the instance group.</p>
  <p>Here's the screens
  <a href="https://i.stack.imgur.com/9OLmf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9OLmf.png" alt="instance group monitoring charst" /></a></p>
  <p>As you can see at 11:35am the CPU Utilization and disk IO graphs went to zero.</p>
  <p>If I check each server &quot;Observability&quot; tab, all graphs are working and showing information:</p>
  <p>Here's the CPU
  <a href="https://i.stack.imgur.com/uNfJg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uNfJg.png" alt="CPU Observability" /></a></p>
  <p>And here's the disk
  <a href="https://i.stack.imgur.com/qVt95.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qVt95.png" alt="disk observability" /></a></p>
  <p>Is there something else I need to configure in the instance group to get the previous charts working? Is this a bug in the Google Cloud Interface?</p>