Looking at the code, it's adding a log event property named "application"
if you set it.
Digging into LoggingEvent, it appears that properties are a synonym for the
MDC. So, MDC.put("application", "some-name") would do it.
Related, I'd recommend upgrading to Log4j 2.x as 1.x is EOL and is not
I'm trying to figure out what system property affects the SocketAppender's
application name. I'm still using Log4j 1.2.
Specifically, the Javadoc for SocketAppender#setApplication(String) says:
"""
The App option takes a string value which should be the name of the
application getting logged. If
