Create Snapshot Definition is a screen shot of an application.
For official documentation 8.3.x : Snapshot generation and validation
In this page, the different logs lines corresponding to the Create Snapshot Definition is listed with functional and technical explanation of the logs that it generates.
The Loglines generated by this task is shown below
CAST-MS-<date>-<time>.log.txt log file
INF: 2018-04-20 16:44:19: starting Task Create Snapshot Definition in "test830_central"
INF: 2018-04-20 16:44:19: Dashboard Service "test830_central" saved in Dashboard Service "test830_central"
INF: 2018-04-20 16:44:19: System "My System" saved in Dashboard Service "test830_central"
INF: 2018-04-20 16:44:19: Application "webgoat" saved in Dashboard Service "test830_central"
INF: 2018-04-20 16:44:19: User Defined Module "webgoat full content" saved in Dashboard Service "test830_central"
INF: 2018-04-20 16:44:19: Task message: No Task message
INF: 2018-04-20 16:44:19: No associated log file
INF: 2018-04-20 16:44:19: ending Task Create Snapshot Definition in "test830_central"