Abstract: In a networked system connecting a subscriber to a content source via one or more networks, a computer-implemented method includes instantiating a session model for a media session between the subscriber and the content source, the session model to generate session metadata from application-layer interactions between the subscriber and the content source. The method further includes instantiating an interaction model in response to detecting an application-layer interaction in a transport flow of the subscriber, the application-layer interaction comprising media data for the media session. The method also includes generating, at the interaction model, interaction metadata representative of the application-layer interaction, and processing at least one of the interaction metadata and the media data at the session model to generate session metadata responsive to matching the interaction model to the session model.