1. A method comprising: determining, by a controller device for a virtual network, a set of two or more related processes executed by respective devices in the virtual network, including a first process executed by a first device of a plurality of devices that form a physical network and a second, different process executed by a second, different device of the plurality of devices, wherein the virtual network comprises an overlay network formed over the physical network and between virtual switches executed by the plurality of devices including a first virtual switch executed by the first device and a second virtual switch executed by the second device, and wherein determining the set of two or more related processes comprises forming the set to include processes that perform similar operations on different instances of respective data; receiving, by the controller device, data for the set of two or more related processes from the respective devices; and aggregating, by the controller device, the data for the set of two or more related processes to form aggregated data for the set of two or more related processes.