Commite64c733

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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
`@@ -241,6 +241,7 @@ BackgroundWriterMain(void)`
`241`	`241`
`242`	`242`	`/* Report pending statistics to the cumulative stats system */`
`243`	`243`	`pgstat_report_bgwriter();`
	`244`	`+pgstat_report_wal(true);`
`244`	`245`
`245`	`246`	`if (FirstCallSinceLastCheckpoint())`
`246`	`247`	`{`

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