From a support point of view, I often find myself asking users/customers to enable the
full conversion pattern in the server.log's log4j appender in order to get a better idea of
what each thread is doing.

I suggest that we add %t to the default conversion pattern to to speed up problem resolution.
The server.log is already verbose enough and few of our users/customers understand it, so
I wouldn't expect such change to have a major impact on our users/customers:

<!-- The default pattern: Date Priority [Category] (Thread) Message\n -->
<param name="ConversionPattern" value="%d %-5p [%c] (%t) %m%n"/>