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Add a new GUC max_repack_replication_slots, which lets the user reserve some additional replication slots for concurrent repack (and only concurrent repack). With this, the user doesn't have to worry about changing the max_replication_slots in order to cater for use of concurrent repack. (We still use the same pool of bgworkers though, but that's less commonly a problem than slots.) Author: Álvaro Herrera <alvherre@kurilemu.de> Reviewed-by: Srinath Reddy Sadipiralla <srinath2133@gmail.com> Discussion: https://postgr.es/m/202604012148.nnnmyxxrr6nh@alvherre.pgsql