nixos/doc: remove prometheus2 notes from the 19.09 release notes
prometheus2 has been backported to 19.03 so it won't be new for 19.09.
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				@ -35,26 +35,6 @@
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   The following new services were added since the last release:
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  </para>
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  <itemizedlist>
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   <listitem>
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    <para>
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       Besides the existing <option>services.prometheus</option> module which
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       targets Prometheus-1 a new <option>services.prometheus2</option> module
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       has been added which targets Prometheus-2.
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    </para>
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    <para>
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       Both modules can be enabled at the same time. In fact
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       <link xlink:href="https://prometheus.io/docs/prometheus/latest/migration/#storage">
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       this is needed for upgrading existing Prometheus-1 data to Prometheus-2
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       </link>.
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    </para>
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   </listitem>
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   <listitem>
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    <para>
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      There is a new <option>services.tox-node</option> module for running tox bootstrap nodes.
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    </para>
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   </listitem>
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  </itemizedlist>
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 </section>
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 <section xmlns="http://docbook.org/ns/docbook"
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@ -87,25 +67,6 @@
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     accordingly.
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    </para>
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   </listitem>
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   <listitem>
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    <para>
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      The directory where Prometheus will store its metric data is now
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      managed by systemd's StateDirectory mechanism. It still defaults
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      to <literal>/var/lib/prometheus</literal>.
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    </para>
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    <para>
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      Its location can be specified by the new
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      <option>services.prometheus.stateDir</option> option which
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      defaults to <literal>prometheus</literal>. Note that this should
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      be a directory relative to <literal>/var/lib/</literal>.
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    </para>
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    <para>
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      The option <option>services.prometheus.dataDir</option> has been
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      deprecated. You can still set it but it's now required to have
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      <literal>/var/lib/</literal> as a prefix and you can't set
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      <option>services.prometheus.stateDir</option> at the same time.
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    </para>
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   </listitem>
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   <listitem>
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    <para>
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      The options <option>services.prometheus.alertmanager.user</option> and
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