From e64c733bb1996e52a13f6fc4a1240703f607fa53 Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Mon, 2 Oct 2023 12:39:35 +0300
Subject: [PATCH] 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
---
 src/backend/postmaster/bgwriter.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/backend/postmaster/bgwriter.c b/src/backend/postmaster/bgwriter.c
index caad642ec9..f2e4f23d9f 100644
--- 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())
 		{