The logging level for the "core" logging component cannot be set using the admin
GUI or by adding the intuitive
attribute in the module-log-levels element in domain.xml.
Kedar has suggested the workaround of setting
<property name="javax.enterprise.system.core" value="FINE"/>
as a child of the module-log-levels element in domain.xml, and this works fine
as a workaround. But it's very cumbersome and is inconsistent with how the
other module levels are controlled.