OpenNMS Horizon 23.0.2 is an update to Horizon 23.0.1.
It contains a number of bug fixes and enhancements, including performance improvements to topology maps, many fixes and improvements to Kafka support, and a bunch of correlation and alarm updates.
For a high-level overview of what's changed in OpenNMS 23, see What's New in OpenNMS 23.
The codename for 23.0.2 is Sabrina.