PingFederate 6.x and 7.x use Log4j to write log messages.
If the Upgrade Utility or the PingFederate installer for Windows determines that the Log4j configuration file ( <pf_install>/pingfederate/server/default/conf/log4j.xml) has changed since it was originally installed, these upgrade tools copy the modified log4j.xml to the new installation with a new name and installs the new log4j2.xml from the product.zip file.
The new name for the previously customized log4j.xml is log4j-old-<SourceVersion>.xml, where <SourceVersion> is the version number of the source PingFederate installation.
Both configuration files are located in the conf directory.
To migrate custom changes from Log4j to Log4j2: