Hi BaDmOnKeY,
there is no direct way of doing this.
But, SiteScope adds an entry to the audit log when a monitor is deleted.
This is from an 11.24 instance:
monitor created
2016-06-02 10:47:17 - User: SiteScope Administrator. Operation performed: Monitor 'ping swvm401' created in 'SiteScope\SGTest'.
monitor deleted
2016-06-02 10:47:50 - User: SiteScope Administrator. Operation performed: Monitor 'ping swvm401' deleted from 'SiteScope\SGTest'.
So you can setup a logfile monitor checking <SiteScope>\logs\audit.log for the pattern
(for example) /Operation performed: Monitor .* deleted from .*/
Greetings
Siggi