1. A system for monitoring interaction with services implemented in a hosted computing environment, the system comprising: a data store configured to store a plurality of service images, wherein each service image includes a set of computer-executable instructions that, when executed within the hosted computing environment, implements an instance of at least one associated service; a monitoring computing device in communication with the data store, the monitoring computing device including a processor configured to at least: receive, from a provider computing device distinct from the monitoring computing device and associated with a provider of a first service, a unique descriptor that identifies the first service; determine a service image associated with the first service; modify computer-executable instructions corresponding to the service image associated with the first service to include the unique descriptor so that each instance of the service image that is executed includes the unique descriptor; receive usage information for a plurality of instances implemented on the hosted computing environment, wherein at least a portion of the plurality of instances correspond to the service image; identify, from the plurality of instances, one or more instances that correspond to the service image based at least in part on detection of the unique descriptor within computer-executable instructions corresponding to each of the one or more instances; and transmit, to the provider computing device, the usage information for the one or more instances that correspond to the service image.