Hi Marcel Thannhaeuser,
Yes, there are some ways to control the logLevel.
Please, find an attribute named as `logginglevel` for both of `oxtrust` and `oxauth` under **JSON Configuration** of Gluu Server GUI, then select the level.
I think it's possible to use python logging in the script. Let me check first. I will let you know the update.
Regards ~ Shakil