Gurobi produces a log so you can track the progress of the optimization.
In v9, a default log file is written only for command-line Gurobi (gurobi_cl) and for the interactive shell (gurobi.sh). When you use one of the APIs to initiate the optimization, you need to specify the name of the log file by using the parameter LogFile.
This file will be written relative to the directory from which you run your application.
In earlier Gurobi versions, the log was automatically stored in a file.