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42b480d286
Improve the documentation for pg_stat_recovery in several ways: - Mention the view in high-availability.sgml as a way to monitor recovery state and replay progress, alongside the existing recovery information functions. - Clarify that the view returns at most one row, not exactly one row, and no rows to users who lack the pg_read_all_stats privilege. - Correct the description of last_replayed_end_lsn to clarify that it is the end LSN of the last replayed record plus one. - Document that replay_end_tli equals last_replayed_tli when no WAL record is currently being replayed. - Clarify that current_chunk_start_time is NULL until streaming WAL has been received. Backpatch to v19, where pg_stat_recovery was introduced. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/CAHGQGwGRavm18HqnQn_f68QB96qk6arhjET1V93OJH09Mgojkg@mail.gmail.com Backpatch-through: 19