According to various embodiments, the present invention provides live site performance monitoring in the context of logical resource hierarchies found in cloud computing systems. In particular, in one embodiment, the system of the present invention facilitates monitoring of new computing services without necessarily requiring explicit knowledge about such new services. Such services can include, for example and without limitation, those provided using a Representational State Transfer (REST) architecture, although the techniques described herein can also be used with other architectures. In one embodiment, the system of the present invention operates by automatically creating groups of items for performance monitoring, based on the hierarchy of a URI. Heuristics can be used to determine aggregatable hierarchy nodes.