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Not a full solution, but it should be possible to change the logger level at runtime with rqt_logger_level, but you won't be able to see debug messages at startup.

You may also want to try starting rviz with __name:=rviz to try to force it to use a non-anonymous name, which might make it pick up the proper logger configuration.

If you're developing plugins and you only want to see debug messages from your plugin, you can also use the ROS_DEBUG_NAMED() with your plugin name.