The User Behavior Insights (UBI) Standard

The most important part of UBI is its standard that defines how queries and user events are defined. The UBI standard is maintained on GitHub.

UBI requires coordination between the client (a browser, a mobile app, etc.) and the backend, which is documented using UBI standard

The schema is documented by itself, but it's much easier to get "the big picture" with a graphical representation:

The UBI standard is available under the Apache Software License, version 2.