doc/nixos/postgress: Mention extensions in upgrading
analyze_new_cluster script is not available in PostgreSQL 14+:
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@ -131,12 +131,25 @@ Type "help" for help.
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</listitem>
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<listitem>
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<para>
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After the upgrade it's advisable to analyze the new cluster (as <literal>su -l postgres</literal> in the
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<xref linkend="opt-services.postgresql.dataDir" />, in this example <filename>/var/lib/postgresql/13</filename>):
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After the upgrade it's advisable to analyze the new cluster.
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</para>
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<itemizedlist>
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<listitem>
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<para>
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For PostgreSQL ≥ 14, use the <literal>vacuumdb</literal> command printed by the upgrades script.
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</para>
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</listitem>
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<listitem>
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<para>
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For PostgreSQL < 14, run (as <literal>su -l postgres</literal> in the <xref linkend="opt-services.postgresql.dataDir" />, in this example <filename>/var/lib/postgresql/13</filename>):
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<programlisting>
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<prompt>$ </prompt>./analyze_new_cluster.sh
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</programlisting>
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<warning><para>The next step removes the old state-directory!</para></warning>
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</para>
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</listitem>
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</itemizedlist>
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<para>
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<warning><para>The next step removes the old state-directory!</para></warning>
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<programlisting>
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<prompt>$ </prompt>./delete_old_cluster.sh
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</programlisting>
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