1. A method comprising: receiving, from a first instance of an application executing on a first remote device, one or more units of call-stack information, the call-stack information including periodic captures of an execution status for the first instance of the application; receiving, from the first instance of the application, an indicator that the first instance of the application has successfully executed an objective; aggregating the received units of call-stack information leading up to the successfully executed objective as a successful trace; collecting a plurality of successful traces from a plurality of instances of the application executing on a plurality of remote devices; receiving, from a second instance of the application executing on a second remote device, one or more units of call-stack information, the call-stack information including periodic captures of an execution status for the second instance of the application; determining a similarity between the call-stack information received from the second instance of the application and the plurality of successful traces; adding the second remote device to a list of devices corresponding to the objective; wherein the objective is at least one of: (i) user interaction with selected content (ii) and continued user engagement with an application.