If all the Archiver roles fail over to the same standby server at the same time, you can assign archiving priorities to the roles to avoid overloading the server.
What you should know
NOTE: At any time on a given server, only the Archiver role with the highest archiving
priority is able to archive. The archiving priority only affects archiving. Having a lower
archiving priority does not prevent a failed over Archiver role from performing its command
and control functions.