This page is used for listing requests for history merges or history splitting of pages. For relatively simple cases where history merge is required, the destination page should be tagged with the {{history merge}} template. This page should be used for requesting very complex merges, merges involving more than two pages, history merges of deleted pages, or when the use of the template is otherwise inadequate or where its usage would cause problems.
This page was originally for listing cut-and-paste moves which could not be repaired due to a then-extant technical limitation. The limitation has since been removed, but this page is still available if you find a cut-and-paste move, and are not able to repair it yourself (there is a procedure for doing it, but only administrators can do it, and it is a bit tricky!).
Administrators need to read Wikipedia:Administrators' guide/Fixing cut-and-paste moves and Wikipedia:Requested moves/Closing instructions.