UAL is a feature introduced in Windows Server 2012. It supports other Windows Server roles to report their respective consumption metrics. Work Folders server uses UAL to report client usage. The logging is not turned on by default. You can enable it through the regkey change. After the regkey is added, you need to restart the SyncShareSvc service on the server, for the logging to take an effect.
When the logging is enabled, you can then use the tools provided through UAL to gather information on client usage.
After the logging is enabled, there will be 2 informational events logged to the Windows Logs\Application channel each time a client connects to the server. For Work Folders, each user may have one or more client devices. All the devices are connecting to the server and checking for data update every 10 minutes. If the server is expecting 1000 users each with 2 devices, the application logs will wrap around in 70 minutes with the default size for event logs. This will make troubleshooting very hard in case of server experiencing issues. Please be aware of this side effect before enabling usage tracking for Work Folders.
Alternatively, the admin can choose to "Archive the log when full" to ensure the events are not getting overwritten.