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if you use gradle-build-action’s caching w/ build cache enabled then the CI builds would only compile/test what has changed (no need for a matrix). Not familiar with jacoco and how to do the aggregation.

That's a good tip! as for the main problem, from what I can see in my project, each submodule generate their own report under their

build

directory so I need to combine them all into a single JSON file (I assume) I'm open to any alternatives to jacoco - I just took it as it's kinda standard for JVM projects

Have you looked at https://docs.gradle.org/current/userguide/jacoco_report_aggregation_plugin.html?

I did, but it's 100% possible I did something wrong 🙂

🙈

I'll try to play with it a bit more.... thanks for the tips! 🙏