No one is challenging the fact that seeing error logs is not good.
When investigating the problem, it obviously matters if metrics are affected or not because that would lead us to a completely different direction.
We only know if the logs in debug make a difference or not once they are posted. It often does make a difference when it comes to problems in the scanner side, hence me requesting it.
Could you please check what files you have in sonarqube_server_home/lib/scanner? Did you upgrade the server installation from Community Edition to Developer Edition at some point?
I suspect that a file was left over from an upgrade and there are 2 files: sonar-scanner-engine-shaded-8.0-all.jar and scanner-developer-8.0-all.jar.
If that’s the case, please delete sonar-scanner-engine-shaded-8.0-all.jar and restart the server.