In SERVER-57825 we added new server statistics which will be printed when server is running file copy based initial sync--a new feature for the enterprise module.

The fields which were added can be found in this document https://docs.google.com/document/d/1UQ0Hs-e1nFGyX4_PU_-ECImla-CLkLPDaEGrVxIijU8/edit#heading=h.i4sji0le9arb under Diagnosis/Debuggability section.