NISO has released SUSHI-Lite: Deploying SUSHI as a Lightweight Protocol for Exchanging Usage via Web Services, a draft for comment.
Here's an excerpt:
ANSI/NISO Z39.93-2014, also known as the SUSHI (Standardized Usage Statistics Harvesting Initiative) standard, is the key to automating the harvesting of COUNTER (Counting Online Usage of NeTworked Electronic Resources) usage statistics. SUSHI is a critical standard for librarians charged with measuring and monitoring the use of their online collections by eliminating hours of painstaking effort that would otherwise be spent locating, retrieving and loading usage reports. However, environmental requirements evolve and standards like SUSHI need to update to serve these requirements. The introduction of various applications into the marketplace which offer alternative metrics, the development of the COUNTER Journal Usage Factor, the flourishing of institutional repositories and need to capture usage from them, and continued progress towards open and integrated systems in general, have all made an impact on how usage is consumed and exchanged. There is now a need for more lightweight technologies that will allow smaller sets of usage data to be exchanged in real-time.