I don't think there's an update, this is server maintenance. It's when they actually tear apart the server equipment and perform hardware updates, do routine cleaning, defragment the numerous hard-drives, etc.
Mang, Hobbit Hunter level 50
Infares, Man Burglar level 17
Dilf, Dwarf Minstrel level 18
Freshly, Man Champion level 17
Cofounder of Solidarity kinship