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Release notes for 18.3, 17.9, 16.13, 15.17, 14.22.
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Tom Lane
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<!-- doc/src/sgml/release-17.sgml -->
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<!-- See header comment in release.sgml about typical markup -->
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<sect1 id="release-17-9">
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<title>Release 17.9</title>
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<formalpara>
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<title>Release date:</title>
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<para>2026-02-26</para>
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</formalpara>
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<para>
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This release contains a small number of fixes from 17.8.
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For information about new features in major release 17, see
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<xref linkend="release-17"/>.
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</para>
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<sect2 id="release-17-9-migration">
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<title>Migration to Version 17.9</title>
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<para>
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A dump/restore is not required for those running 17.X.
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</para>
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<para>
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However, if you are upgrading from a version earlier than 17.6,
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see <xref linkend="release-17-6"/>.
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</para>
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</sect2>
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<sect2 id="release-17-9-changes">
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<title>Changes</title>
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<itemizedlist>
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<listitem>
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<!--
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Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
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Branch: REL_18_STABLE [817f74600] 2026-02-16 17:16:59 +0200
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Branch: REL_17_STABLE [4a36c89f1] 2026-02-16 17:18:17 +0200
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Branch: REL_16_STABLE [23064542f] 2026-02-16 17:20:29 +0200
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Branch: REL_15_STABLE [899de38d8] 2026-02-16 17:20:51 +0200
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Branch: REL_14_STABLE [547a8aaa7] 2026-02-16 17:20:56 +0200
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-->
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<para>
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Fix failure after replaying a multixid truncation record from WAL
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that was generated by an older minor version (Heikki Linnakangas)
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<ulink url="&commit_baseurl;4a36c89f1">§</ulink>
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</para>
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<para>
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Erroneous logic for coping with the way that previous versions
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handled multixid wraparound led to replay failure, with messages
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like <quote>could not access status of transaction</quote>.
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A typical scenario in which this could occur is a standby server of
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the latest minor version consuming WAL from a primary server of an
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older version.
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Noah Misch <noah@leadboat.com>
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Branch: master [9f4fd119b] 2026-02-14 12:16:16 -0800
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Branch: REL_18_STABLE [6e045e1a6] 2026-02-14 12:16:19 -0800
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Branch: REL_17_STABLE [5d5232bc3] 2026-02-14 12:16:20 -0800
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Branch: REL_16_STABLE [bdfb37228] 2026-02-14 12:16:20 -0800
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Branch: REL_15_STABLE [a20eb248c] 2026-02-14 12:16:21 -0800
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Branch: REL_14_STABLE [14b1fd617] 2026-02-14 12:16:21 -0800
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Branch: master [8cef93d8a] 2026-02-16 18:04:58 -0800
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Branch: REL_18_STABLE [d04b34d68] 2026-02-16 18:05:01 -0800
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Branch: REL_17_STABLE [50d361f62] 2026-02-16 18:05:02 -0800
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Branch: REL_16_STABLE [2280ab354] 2026-02-16 18:05:02 -0800
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Branch: REL_15_STABLE [ec86152e0] 2026-02-16 18:05:02 -0800
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Branch: REL_14_STABLE [a0769e74d] 2026-02-16 18:05:03 -0800
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Branch: master [4644f8b23] 2026-02-14 12:16:16 -0800
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Branch: REL_18_STABLE [4174e41b9] 2026-02-14 12:16:19 -0800
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Branch: REL_17_STABLE [8e73530f1] 2026-02-14 12:16:20 -0800
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Branch: REL_16_STABLE [45eb47230] 2026-02-14 12:16:20 -0800
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Branch: REL_15_STABLE [5b305ebcc] 2026-02-14 12:16:20 -0800
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Branch: REL_14_STABLE [44fc85bbf] 2026-02-14 12:16:21 -0800
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-->
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<para>
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Avoid incorrect complaint of invalid encoding
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when <function>substring()</function> is applied
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to <quote>toasted</quote> data (Noah Misch)
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<ulink url="&commit_baseurl;5d5232bc3">§</ulink>
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<ulink url="&commit_baseurl;50d361f62">§</ulink>
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<ulink url="&commit_baseurl;8e73530f1">§</ulink>
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</para>
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<para>
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The fix for CVE-2026-2006 was too aggressive and could raise an
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error about an incomplete character in cases that are actually
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valid.
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Richard Guo <rguo@postgresql.org>
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Branch: master [691977d37] 2026-02-20 17:57:53 +0900
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Branch: REL_18_STABLE [ed57c207c] 2026-02-20 18:00:02 +0900
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Branch: REL_17_STABLE [bcaf1b510] 2026-02-20 18:01:56 +0900
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Branch: REL_16_STABLE [ec20a4552] 2026-02-20 18:04:26 +0900
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-->
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<para>
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Fix computation of the set of potentially-nulling outer joins for
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the output of a <literal>LATERAL UNION ALL</literal> subquery
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(Richard Guo)
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<ulink url="&commit_baseurl;bcaf1b510">§</ulink>
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</para>
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<para>
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This error could lead to skipping <literal>NOT NULL</literal> tests
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in the mistaken belief that they were unnecessary, resulting in
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wrong query output.
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
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Branch: master [78a5e3074] 2026-02-11 18:50:57 +0200
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Branch: REL_18_STABLE [53463b4b2] 2026-02-11 18:51:06 +0200
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Branch: REL_17_STABLE [842473337] 2026-02-11 18:51:12 +0200
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Branch: REL_16_STABLE [2332911ae] 2026-02-11 18:51:19 +0200
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Branch: REL_15_STABLE [ebc53ca7b] 2026-02-11 18:51:25 +0200
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Branch: REL_14_STABLE [82b495cdd] 2026-02-11 18:51:32 +0200
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-->
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<para>
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Fix <function>pg_stat_get_backend_wait_event()</function>
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and <function>pg_stat_get_backend_wait_event_type()</function>
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to report values for auxiliary processes (Heikki Linnakangas)
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<ulink url="&commit_baseurl;842473337">§</ulink>
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</para>
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<para>
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Previously these functions returned NULL for auxiliary processes,
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but that's inconsistent with
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the <structname>pg_stat_activity</structname> view.
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Tom Lane <tgl@sss.pgh.pa.us>
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Branch: master [9863c9075] 2026-02-11 16:53:14 -0500
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Branch: REL_18_STABLE [ce4b7e3a1] 2026-02-11 16:53:14 -0500
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Branch: REL_17_STABLE [dfd850980] 2026-02-11 16:53:14 -0500
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Branch: REL_16_STABLE [c66f4cff1] 2026-02-11 16:53:14 -0500
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Branch: REL_15_STABLE [254b15cbf] 2026-02-11 16:53:14 -0500
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Branch: REL_14_STABLE [2b93d3820] 2026-02-11 16:53:14 -0500
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-->
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<para>
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Fix casting a composite-type variable to a domain type when
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returning its value from a PL/pgSQL function (Tom Lane)
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<ulink url="&commit_baseurl;dfd850980">§</ulink>
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</para>
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<para>
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If the variable's value is NULL, a <quote>cache lookup failed for
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type 0</quote> error resulted.
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Michael Paquier <michael@paquier.xyz>
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Branch: master [a6f823e77] 2026-02-17 08:41:26 +0900
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Branch: REL_18_STABLE [4a0843c53] 2026-02-17 08:41:30 +0900
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Branch: REL_17_STABLE [0dfbe42da] 2026-02-17 08:41:32 +0900
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Branch: REL_16_STABLE [31d0b917d] 2026-02-17 08:41:34 +0900
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Branch: REL_15_STABLE [63c05e03b] 2026-02-17 08:41:35 +0900
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Branch: REL_14_STABLE [f604cc695] 2026-02-17 08:41:37 +0900
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-->
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<para>
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Fix potential null pointer dereference
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in <filename>contrib/hstore</filename>'s binary input function
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(Michael Paquier)
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<ulink url="&commit_baseurl;0dfbe42da">§</ulink>
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</para>
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<para>
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<type>hstore</type>'s receive function crashed on input containing
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duplicate keys. <type>hstore</type> values generated by Postgres
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would never contain duplicate keys, so this mistake has gone
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unnoticed. The crash could be provoked by malicious or corrupted
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data.
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</para>
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</listitem>
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</itemizedlist>
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</sect2>
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</sect1>
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<sect1 id="release-17-8">
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<title>Release 17.8</title>
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