Please include expression.
Thank you for this info. These expressions are OK. These gaps are expected behavior when components are not reachable (return null data). Any chance some of these machines where restarted around 8:35 or re-registered? We will evaluate new charting options and see if instead of these gaps, the bar could be compressed.
No restarts on the servers. I actually noticed this yesterday afternoon sometime after I created the stacked bar chart. However, I am going to check with security to make sure something is not doing the blocking.