Everywhere within monitoring items you'll get the choice to which groups you want to notify this item. Read about Groups for further information about the usage of groups within the application.
In general there are two choices:
When you choose Inherit System Escalation Groups, the application will look real time in the Inventory List and will take the setting "Receive Notifications" as you have configured via the Groups Receives Notifications
When choose from the list box the same Groups as the Inherit (In this case TeamServer group). This monitored Item will not follow the Inherit System Escalation Groups,