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The rosconsole page that you link to has a section on setting the logger level that includes some example C++ code for changing the logger level. Is this what you're looking for?

If you want to change the logger level for the entire DWA local planner, you might want to consider switching all of its logger macros to use the named logger macros. This will allow you to the logger level for DWA separately from the rest of your code. This is probably a useful enough change that it would be worth submitting it into the public ROS navigation stack.