Currently the format of the logging file is hard-coded in the LogDataFormatter provided by Petals.
But it should be possible, in the same manner as Java's SimpleFormatter, to have it customizable in the loggers.properties file.
The extra log parameters (extracted by the LogDataFormatter) will be considered as part of the log message (postfix).
The container name (extracted by the LogDataFormatter) will prefix the complete log message.
Default configuration will be exactly equivalent as before.