Scratchpad is the "Design Mode of the Health Monitor". Through Scratchpad you can design and configure:
Collector Managers
Collectors
Event Sources
Connectors
Event Source Servers
You may right-click the Sentinel icon and add the components. For more information, see "Adding components to Event Source Hierarchy".
NOTE: You cannot view the status of any object in the design mode as they are not connected to an instance of a real Collector Manager.