PXED logging

Logging parameters are specified in a container like the database, but the container keyword is logging_info.

When learning to configure PXED, it is advisable to turn logging to its highest level. Also, it is best to specify the logging configuration prior to any other configuration file data to ensure that configuration errors are logged after the logging subsystem is initialized. Use the logitem keyword to turn on a logging level or remove the logitem keyword to disable a logging level. Other keywords for logging allow the specification of the log filename, file size, and the number of rotating log files.