"remote_flush" has never been a valid user-facing value, but "on" is.
Author: Maksim Milyutin
Discussion: https://postgr.es/m/
27b3b80c-3615-2d76-02c5-
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notification that this standby server has written and flushed it
(but not yet applied it). This can be used to gauge the delay that
<literal>synchronous_commit</literal> level
- <literal>remote_flush</literal> incurred while committing if this
+ <literal>on</literal> incurred while committing if this
server was configured as a synchronous standby.</entry>
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