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This commit introduces a new GUC option max_active_replication_origins to control the maximum number of active replication origins. Previously, this was controlled by 'max_replication_slots'. Having a separate GUC option provides better flexibility for setting up subscribers, as they may not require replication slots (for cascading replication) but always require replication origins. Author: Euler Taveira <euler@eulerto.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Peter Eisentraut <peter@eisentraut.org> Reviewed-by: vignesh C <vignesh21@gmail.com> Discussion: https://postgr.es/m/b81db436-8262-4575-b7c4-bc0c1551000b@app.fastmail.com