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The I/O timing information collected when track_io_timing is enabled is now documented to appear in the pg_stat_io view, which was previously not mentioned. This commit also enhances the description of track_io_timing to clarify that it monitors not only block read and write but also block extend and fsync operations. Additionally, the description of track_wal_io_timing has been improved to mention both WAL write and WAL fsync monitoring. Backpatch to v16 where pg_stat_io was added. Author: Hajime Matsunaga Reviewed-by: Melanie Plageman, Nazir Bilal Yavuz, Fujii Masao Discussion: https://postgr.es/m/TYWPR01MB10742EE4A6F34C33061429D38A4D52@TYWPR01MB10742.jpnprd01.prod.outlook.com