How to find out who deleted a folder in Spotfire Library?

Here are the steps that you need if you want to find what user created or deleted a folder in the Spotfire Library
In the Spotfire Server <Spotfire Server installation dir>/tomcat/logs folder you will find the library.log file 

Within this file you can see activities from the library
 
Here is an example of the “admin” creating a folder called “Test_Folder”
10.17.19.9;;admin;2017-03-03T10:11:58,637-0800;Item saved;Test_Folder;spotfire.folder;0;a101eccb-3087-4a36-9fdf-032a1896a0d4
 
Here is an example of the user  “andrew” deleting the same folder called “Test_Folder”:
10.17.19.9;;andrew;2017-03-03T10:12:45,889-0800;Item deleted;Test_Folder;spotfire.folder;0;a101eccb-3087-4a36-9fdf-032a1896a0d4

An explanation of the log extract: 
Ip address of the user: 10.17.19.9
Spotfire username: andrew
Date &time:  2017-03-03T10:12:45
Action performed: Item deleted
Item name: Test_Folder
Type of Item: spotfire.folder