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Commit e64c733

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Flush WAL stats in bgwriter
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
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‎src/backend/postmaster/bgwriter.c

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@@ -241,6 +241,7 @@ BackgroundWriterMain(void)
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/* Report pending statistics to the cumulative stats system */
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pgstat_report_bgwriter();
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pgstat_report_wal(true);
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if (FirstCallSinceLastCheckpoint())
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{

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