On Thu, Apr 10, 2025 at 04:39:45PM -0500, Sami Imseih wrote:
> Also, The documentation for pg_stat_wal already makes this point clear
> in [0] that "wal_sync is only
> incremented when the wal_sync_method is either fdatasync, fsync or
> fsync_writethrough".
>
> Perhaps, the same clarification will be beneficial for the
> pg_stat_io.fsyncs* fields?
wal_sync and wal_sync_time (and the write parts) have been moved from
pg_stat_wal to pg_stat_io under the 'wal' object, and these details
with wal_sync_method are documented here:
https://www.postgresql.org/docs/devel/wal-configuration.html
The docs of pg_stat_io include a paragraph that link to the WAL
configuration:
https://www.postgresql.org/docs/devel/monitoring-stats.html#MONITORING-PG-STAT-IO-VIEW
`For the object wal, fsyncs and fsync_time track the fsync.. blah.`
The current format is intentional to reduce the amount of duplication
in the docs regarding this level of details to one place: the section
that describes in details the internals of the WAL I/O activity.
--
Michael
