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bgwriter can write out WAL, but did not flush the WAL pgstat counters, so the writes were not seen in pg_stat_wal. Back-patch to v14, where pg_stat_wal was introduced. Author: Nazir Bilal Yavuz Reviewed-by: Matthias van de Meent, Kyotaro Horiguchi Discussion: https://www.postgresql.org/message-id/CAN55FZ2FPYngovZstr%3D3w1KSEHe6toiZwrurbhspfkXe5UDocg%40mail.gmail.com