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


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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