You mean the "ARM" menu? That's just an aggregation of the most common logfiles from astaro. All logs are added to one file for each day. So you will have different formats. One file for each day. Several logs in one file. Just download the file and extract it. Then have a look to it.
Thanks for you reply but this part I already know. What I need to know is what is the format after extraction. It comes out with a .gz extension that I am not familiar with. I tried ASCII format but this is not ASCII. Can you help?