The stdout debug logging level can not be changed at runtime via the console.
Add this to the Dockerfile for openam
Start OpenAM. The debug log level is set properly to message (other values work fine here as well).
However, if you want to change this at runtime it does not appear that the console GUI settings have any impact.
I tried to change both the server global default and the specific server default (setting the message level to "OFF:", for example). There is no change