Unable to view the CPU usage in SQL metrics in Aria Operations for Microsoft SQL Server Standard database instances.
Aria Operations 8.18.X
Aria Operations Management pack for MicrosoftSQLServer 9.x
This is a limitation of Microsoft SQL Server, and has no workaround.
As per Aria Operations Management pack for MicrosoftSQLServer 9.x System Requirements:
The CPU Usage metric for Microsoft SQL Server Instances is not available on MS SQL Server Standard or Express editions.