Commit5940018

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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 YavuzReviewed-by: Matthias van de Meent, Kyotaro HoriguchiDiscussion:https://www.postgresql.org/message-id/CAN55FZ2FPYngovZstr%3D3w1KSEHe6toiZwrurbhspfkXe5UDocg%40mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -247,6 +247,7 @@ BackgroundWriterMain(void)`
`247`	`247`	`* Send off activity statistics to the stats collector`
`248`	`248`	`*/`
`249`	`249`	`pgstat_send_bgwriter();`
	`250`	`+pgstat_send_wal(true);`
`250`	`251`
`251`	`252`	`if (FirstCallSinceLastCheckpoint())`
`252`	`253`	`{`

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