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docs: Improve the description of num_timed column in pg_stat_checkpointer.

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The previous documentation stated that num_timed reflects the number of
scheduled checkpoints performed. However, checkpoints may be skipped
if the server has been idle, and num_timed counts both skipped and completed
checkpoints. This commit clarifies the description to make it clear that
the counter includes both skipped and completed checkpoints.

Back-patch to v17 where pg_stat_checkpointer was added.

Author: Fujii Masao
Reviewed-by: Alexander Korotkov
Discussion: https://postgr.es/m/9ea77f40-818d-4841-9dee-158ac8f6e690@oss.nttdata.com
This commit is contained in:
Fujii Masao 2024-09-19 02:14:10 +09:00
parent 24f5205948
commit a7c39db5eb
1 changed files with 4 additions and 1 deletions
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doc/src/sgml/monitoring.sgml
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@ -3051,7 +3051,10 @@ description | Waiting for a newly initialized WAL file to reach durable storage
<structfield>num_timed</structfield> <type>bigint</type>
</para>
<para>
Number of scheduled checkpoints that have been performed
Number of scheduled checkpoints due to timeout.
Note that checkpoints may be skipped if the server has been idle
since the last one, and this value counts both completed and
skipped checkpoints
</para></entry>
</row>