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Replication slot synchronization (sync_replication_slots = on) requires wal_level to be logical. This commit prevents the server from starting if sync_replication_slots is enabled but wal_level is set to minimal or replica. Failing early during startup helps users catch invalid configurations immediately, which is important because changing wal_level requires a server restart. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Shveta Malik <shveta.malik@gmail.com> Discussion: https://postgr.es/m/CAH0PTU_pc3oHi__XESF9ZigCyzai1Mo3LsOdFyQA4aUDkm01RA@mail.gmail.com