Hi all! I've recently written a blog post about Wikimedia's Event Data Platform. We use JSON, and do things a little bit differently than Confluent's Stream Data Platform.
https://techblog.wikimedia.org/2020/09/10/wikimedias-event-data-platform-or-json-is-ok-too/ There will be 2 more posts coming out over the next couple of weeks too. Thanks for reading! :) - Andrew Otto Engineer @ The Wikimedia Foundation