• If you run low on disk space, your first step might be to clear down temporary files
• Or if a service stops, you want to restart it, then check why it failed.

But why do these manually, when the monitor can do it for you ? With Sentry-go, you can easily define the actions you wish to take. If these don't resolve the problem (or maybe if they do), you can then be alerted.
 

• Launch an external command or start an 3rd party application in order to transfer control to another utility.
• Run a batch file, where only simply logic is required, e.g. to delete temporary files. 
• Run a VBScript, where more complex logic can be performed etc.

• Rebooting the local server
• Restarting a failed service
• Launching X copies of an appliation
• Terminating an application
• Pausing or deleting a print job
• Redirecting a print queue
• Terminating a SQL connection