1

"May 2017 CU for SharePoint 2013 product family" CU update adding Maintenance log library to the existing site. The library has the log file.

2

MaintenanceLogs library is old features which is there since sharepoint 2013 ( i believe). this library store the logs file related to site collection upgrade and you can access it via https://sitexcollectionurl/_catalogs/MaintenanceLogs.

Review site collections upgraded to SharePoint 2013

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