Since January 2022 I’ve been working on (and blogging about) Quamina, a Go-language open-source library that implements the same kind of efficient event-filtering that AWS EventBridge offers.
Yesterday (with help from others) I pushed the “release v1.0.0” button.
If you’re interested in some combination of Go and event-driven software and high performance you might like it.
https://www.tbray.org/ongoing/When/202x/2023/01/25/Quamina-1.0