I’m publishing to Android but even when you don’t enable the development build option, unity outputs a huge amount of
stuff to the Androids log cat. How can I switch this off for a production release?
As for the Unity built-in output - I don’t think you really can. Here is a tip Disable LogCat Output COMPLETELY in release Android app? - Stack Overflow which works in Java, so you would have to export your Unity project as an Android project and do further configuration manually. But we also have output from the native land…
Android OS and services by themselves are writing lots of stuff into logcat, so this is normal behavior.