After Upgrading the Citrix Environment to Citrix Virtual Apps & Desktop 1912 LTSR CU2 unable to populate the Top 10 Processes under Historical Machine Utilization.

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Steps 1 : 

If running the following command doesn't resolve the issue with Top 10 Processes enumerating in Citrix Director follow the Step 2 instructions.

Set-MonitorConfiguration -EnableDayLevelGranularityProcessUtilization $True 
Set-MonitorConfiguration -EnableHourLevelGranularityProcessUtilization $True
Set-MonitorConfiguration -EnableMinLevelGranularityProcessUtilization $True 

Step 2 : 

Set or modify the following Registry on VDA:

1).HKLM\Software\Citrix\GroupPolicy\SaveRsopToFile Type : DWORD(32-bit) Value Data: 1

2).HKLM\Software\Citrix\GroupPolicy\SaveRsopToRegistry Type : DWORD(32-bit) Value Data: 0

3). Delete the original Policy "Enable process monitoring" and re-create it.

4). Restart the VDA Server / VDI Desktop or do a GPUPDATE /Force to push the policies on VDA machine. 

5). Restart Citrix Controllers (DDC) and Citrix Director Servers  

Note: If due to some reasons you are unable to restart the Citrix Controller Servers you may restart the Citrix Broker Service and Citrix Monitor Service.

6). Wait for about 10 minutes, then check the Top 10 process in Director.

7). The Top 10 Processes should show up.

NOTE : Last Option To Get The Issue Fixed is To Uninstall VDA Component and Install Again. 

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Problem Cause

Ran Get-MonitorConfiguration and found that the below settings were set to False:

EnableDayLevelGranularityProcessUtilization                                                                             False                                                                                                                  
EnableHourLevelGranularityProcessUtilization                                                                            False                                                                                                                  
EnableMinLevelGranularityProcessUtilization                                                                             False         
 

Top 10 Process Table Does not Populate Any Data Under Historical Machine Utilization even after enabling the following settings : Set-MonitorConfiguration -EnableDayLevelGranularityProcessUtilization $True  Set-MonitorConfiguration -EnableHourLevelGranularityProcessUtilization $True Set-MonitorConfiguration -EnableMinLevelGranularityProcessUtilization $True 

https://support.citrix.com/article/CTX233555