The search in central returns hits for both EAP 6.3.0 and 6.4.0, which appear as duplicate (try searching for logging level).
http://www.jboss.org/developer-materials/#!sys_type=jbossdeveloper_quickstart&query=logging has a similar issue.

This is confusing and annoying to test JBIDE-18494.

We need to distinguish them. Adding product+version as a tag seems effective