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I'm asking because I usually use

ctrl

+

C

but I notice that, some time after doing that I end up with a "busy daemon" and gradle needs to create a new one (no good).

I don't think there is something better. But usually that should not lead to a busy daemon.

Gradle should already be doing the right thing when you do

ctrl-c

. The daemon will try to cancel the current build, including generating the scan. If it can't do so in a short period of time, it will kill itself. Either way, you shouldn't see a busy daemon. It's possible that there's something specific to the tasks you are running that is broken.