You can set thresholds on the following parameters:
Select this parameter:  | 
If you want to:  | 
CPU  | 
Monitor the CPU state on the SQL host.  | 
Monitor free memory on the SQL host.  | 
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Disk  | 
Monitor disk usage on the SQL host by the SQL server.  | 
Monitor free disk space on the SQL host.  | 
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Monitor system processes on the SQL host.  | 
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Monitors SQL page buffers.  | 
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Monitors cache usage on the SQL server.  | 
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Monitors wait locks on the SQL server.  | 
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Monitors the transactions on the SQL server.  | 
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Monitors the users on the SQL server.  | 
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Monitors SQL alerts and severity of alerts.  | 
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Browse and select from the large number of additional parameters that SQL reports.  |