There are many log files and the important ones would be

• Packet trace recording packet flow through the network (end to end)
• Radio measurements that logs various pathloss, interference, SINR, MCS etc
• Radio resource allocation for MAC layer PRB allocation

All files can be opened and analyzed in MS excel.

Yes, like Sai R N says there are many files. Some provide network level metrics, then there is cell level, application level and finally packet level. Apart from various measurements are provided for debug/in-depth analysis. So, it all depends on what kind of data you need.

You can see the 5G data files images in https://tetcos.com/5g.html. All data is in excel and pre-formatted with filters, pivot tables, etc. I have found this data quite easy to process given Excel's simplicity and power.

What is the frequency at which the radio measurement parameters are written to file? Are MIMO and beamforming attributes also logged?

Yes, each “layer” of MIMO is written as a row, while beamforming gain is a column (since it is measured for all layers) in the measurements file. A layer is defined as Min (Nt, Nr) where Nt is the transmit antenna count and Nr is the receive antenna count.

This is a useful article explaining some details of how to use the measurements file https://support.tetcos.com/support/solutions/articles/14000141188-how-to-obtain-sinr-mcs-and-throughput-vs-time-for-a-5g-1gnb-1ue-scenario-with-a-time-varying-radio-

Some useful videos