Can USOShared log files be deleted?

ETL stands for Event Trace Log file which is created by Microsoft Tracelog, a program that creates logs using the events from the kernel in Microsoft operating systems. It contains trace messages that have been generated during trace sessions, such as disk accesses or page faults. ETL files are used to log high-frequency events while tracking the performance of an operating system.

Microsoft Windows records application and system-level warnings, errors, or other events to these binary files called the event trace logs, which can then be used to troubleshoot potential problems.

To answer your query, you may delete these files and deleting will not affect anything on your system.

The abnormal part is why do you have so many of them. If you cannot remember having turned on tracing in some part of Windows, it will take real detective work to find it out.