@Julie Mohr Here are few documents that will help you in monitoring SQL server and SSAS.
SQL Server
- Monitor Azure SQL Database using Azure SQL Analytics
- Optimize your SQL environment with the SQL Server Health Check solution in Azure Monitor
SSAS
Also please note that Perf table contains the logs of Virtual Machines, Virtual Machine Scale Sets and Kubernetes Services. For more information on each of the tables based on resource type , you can refer this document.