The function LogProgress(Messsage) writes a message to the eBiss log with log level 'Progress'. A log level that is active in a normal job run and also in the mapping debugger, e.g. the message will be visible in the log.
LogProgress(Message, every)
LogProgress(concat('Process articles for number: ', @Key1))
Write every 5000 log call:
LogProgress('Do step number {0}.', 5000)