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Commit e820db5

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akorotkovakorotkov
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Improve documentation for pg_stat_checkpointer fields
pg_stat_checkpointer contains statistics for checkpoints and restartpoints. Before 12915a5 documentation said only about checkpoints implying that restartpoint is the variation of checkpoint. 12915a5 introduced new separate statistics fields for restartpoints. This commit explicitly documents fields that are relevant for both checkpoints and restartpoints. Reported-by: Magnus Hagander Discussion: https://postgr.es/m/CABUevExav5-SR0x%2BG9kBUMV0G8XsvSUfuyyqmYBBJi6VHns6sw%40mail.gmail.com Reviewed-by: Anton A. Melnikov
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‎doc/src/sgml/monitoring.sgml

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@@ -3016,7 +3016,8 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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</para>
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<para>
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Total amount of time that has been spent in the portion of
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checkpoint processing where files are written to disk, in milliseconds
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processing checkpoints and restartpoints where files are written to disk,
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in milliseconds
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</para></entry>
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</row>
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</para>
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<para>
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Total amount of time that has been spent in the portion of
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checkpoint processing where files are synchronized to disk, in
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milliseconds
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processing checkpoints and restartpoints where files are synchronized to
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disk, in milliseconds
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</para></entry>
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</row>
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<structfield>buffers_written</structfield> <type>bigint</type>
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</para>
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<para>
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Number of buffers written during checkpoints
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Number of buffers written during checkpoints and restartpoints
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</para></entry>
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</row>
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‎src/include/catalog/pg_proc.dat

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@@ -5737,7 +5737,7 @@
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proparallel => 'r', prorettype => 'int8', proargtypes => '',
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prosrc => 'pg_stat_get_checkpointer_restartpoints_performed' },
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{ oid => '2771',
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descr => 'statistics: number of buffers written by the checkpointer',
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descr => 'statistics: number of buffers written during checkpoints and restartpoints',
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proname => 'pg_stat_get_checkpointer_buffers_written', provolatile => 's',
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proparallel => 'r', prorettype => 'int8', proargtypes => '',
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prosrc => 'pg_stat_get_checkpointer_buffers_written' },
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proparallel => 'r', prorettype => 'timestamptz', proargtypes => '',
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prosrc => 'pg_stat_get_bgwriter_stat_reset_time' },
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{ oid => '3160',
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descr => 'statistics: checkpoint time spent writing buffers to disk, in milliseconds',
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descr => 'statistics: checkpoint/restartpoint time spent writing buffers to disk, in milliseconds',
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proname => 'pg_stat_get_checkpointer_write_time', provolatile => 's',
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proparallel => 'r', prorettype => 'float8', proargtypes => '',
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prosrc => 'pg_stat_get_checkpointer_write_time' },
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{ oid => '3161',
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descr => 'statistics: checkpoint time spent synchronizing buffers to disk, in milliseconds',
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descr => 'statistics: checkpoint/restartpoint time spent synchronizing buffers to disk, in milliseconds',
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proname => 'pg_stat_get_checkpointer_sync_time', provolatile => 's',
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proparallel => 'r', prorettype => 'float8', proargtypes => '',
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prosrc => 'pg_stat_get_checkpointer_sync_time' },

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