Source confirms that Milwaukee's end of this trade was:

UTL Esteury Ruiz (to OAK)
for
RHP Justin Yeager (from ATL), RHP Joel Payamps (from OAK), and C William Contreras (from ATL)

Still unclear if there's more names exchanged between ATL and OAK than have been reported.

— Kiley McDaniel (@kileymcd) December 12, 2022