1. A computer implemented method for managing resource-specific metric annotations in a system management graph, the computer implemented method comprising: detecting selection of a set of computer resources in a system management graph in a graphical user interface; retrieving annotation options available to the selected set of computer resources from an object model, wherein the object model defines computer resources in a data processing system and relationships among the computer resources, and wherein the annotation options represent resource metrics collected for the set of computer resources; creating a menu using the annotation options for the selected set of computer resources; displaying the menu to a user in the graphical user interface; responsive to detecting selection of a set of annotation options in the menu, updating the system management graph to display annotations, corresponding to the selected set of annotation options, for the selected set of computer resources to form an updated system management graph; and providing the updated system management graph to the user in the graphical user interface, and wherein the object model comprises a plurality of instantiated class objects associated with the selected set of resources, relationships among the plurality of instantiated class objects, and a list of annotations available for each type of class object of the plurality of instantiated class objects.