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

diff --git a/src/backend/postmaster/bgwriter.c b/src/backend/postmaster/bgwriter.c
index caad642ec93b9191c8b5b638123c263764e68fb8..f2e4f23d9fc90efa8d5f65f28075b0c51499bfd7 100644 (file)
--- a/src/backend/postmaster/bgwriter.c
+++ b/src/backend/postmaster/bgwriter.c
@@ -241,6 +241,7 @@ BackgroundWriterMain(void)
 
        /* Report pending statistics to the cumulative stats system */
        pgstat_report_bgwriter();
+       pgstat_report_wal(true);
 
        if (FirstCallSinceLastCheckpoint())
        {