8000 doc: Update outdated descriptions of wal_status in pg_replication_slots. · postgres/postgres@db51bdf · GitHub
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    doc: Update outdated descriptions of wal_status in pg_replication_slots.
    The documentation for pg_replication_slots previously mentioned only max_slot_wal_keep_size as a condition under which the wal_status column could show unreserved or lost. However, since commit be87200, replication slots can also be invalidated due to horizon or wal_level, and since commit ac0e331, idle_replication_slot_timeout can also trigger this state. This commit updates the description of the wal_status column to reflect that max_slot_wal_keep_size is not the only cause of the lost state. Back-patched to v16, where the additional invalidation cases were introduced. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Nisha Moond <nisha.moond412@gmail.com> Discussion: https://postgr.es/m/78b34e84-2195-4f28-a151-5d204a382fdd@oss.nttdata.com Backpatch-through: 16
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    ‎doc/src/sgml/system-views.sgml

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    @@ -2478,20 +2478,18 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
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    <para>
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    <literal>unreserved</literal> means that the slot no longer
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    retains the required WAL files and some of them are to be removed at
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    the next checkpoint. This state can return
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    the next checkpoint. This typically occurs when
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    <xref linkend="guc-max-slot-wal-keep-size"/> is set to
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    a non-negative value. This state can return
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    to <literal>reserved</literal> or <literal>extended</literal>.
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    </para>
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    </listitem>
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    <listitem>
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    <para>
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    <literal>lost</literal> means that some required WAL files have
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    been removed and this slot is no longer usable.
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    <literal>lost</literal> means that this slot is no longer usable.
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    </para>
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    </listitem>
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    </itemizedlist>
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    The last two states are seen only when
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    <xref linkend="guc-max-slot-wal-keep-size"/> is
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    non-negative.
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    </para></entry>
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    </row>
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