After upgrading UIM from 8.51 to uim 9.0.2 existing dashboard which has qos data source not showing data chart now. Although can confirm that there is data on SLM for same qos metric i.e qos_cpu_usage for total target.
Environment
UIM 8.51 UIM 9.02
Resolution
As can see in SLM snapshot there is duplicate data like 2 Total QOS ,2 User QOS etc
Error message on selecting Update on concerned qos data_source Message Processing Error:Incorrect result size: expected 1, actual 2
Identify and remove the duplicate QOS from SLM which does not have QOS data the dashboard qos data displays correctly