https://wccftech.com/battle-for-azeroth-pvp-nerfs/

Blizzard has rolled out Battle for Azeroth nerfs for healers, rogues and mages in PvP and has said it will be addressing other overperforming specs in a future hotfix.

The nerfs include reduced mana generation for healers by 30% and Azerite Traits for Balance Druids,  Assassination Rogues and Windwalker Monks.