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nixos/prometheus-dovecot-exporter: enhance socketPath documentation

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In Dovecot 2.3[1] the stats module changed and now the UNIX socket
provided by Dovecot by default isn't compatible anymore with the
exporter[2]. By enabling the `old-stats` plugin in Dovecot this issue
can be solved which should be documented in this module.

[1] https://wiki2.dovecot.org/Upgrading/2.3
[2] https://github.com/kumina/dovecot_exporter/issues/8
This commit is contained in:
Maximilian Bosch 2019-01-15 15:01:23 +01:00
parent 15d8f837c6
commit ca72dbd125
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1 changed files with 23 additions and 1 deletions
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24
nixos/modules/services/monitoring/prometheus/exporters/dovecot.nix
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@ -18,12 +18,34 @@ in
socketPath = mkOption {
type = types.path;
default = "/var/run/dovecot/stats";
example = "/var/run/dovecot2/stats";
example = "/var/run/dovecot2/old-stats";
description = ''
Path under which the stats socket is placed.
The user/group under which the exporter runs,
should be able to access the socket in order
to scrape the metrics successfully.
Please keep in mind that the stats module has changed in
<link xlink:href="https://wiki2.dovecot.org/Upgrading/2.3">Dovecot 2.3+</link> which
is not <link xlink:href="https://github.com/kumina/dovecot_exporter/issues/8">compatible with this exporter</link>.
The following extra config has to be passed to Dovecot to ensure that recent versions
work with this exporter:
<programlisting>
{
<xref linkend="opt-services.prometheus.exporters.dovecot.enable" /> = true;
<xref linkend="opt-services.prometheus.exporters.dovecot.socketPath" /> = "/var/run/dovecot2/old-stats";
<xref linkend="opt-services.dovecot2.extraConfig" /> = '''
mail_plugins = $mail_plugins old_stats
service old-stats {
unix_listener old-stats {
user = nobody
group = nobody
}
}
''';
}
</programlisting>
'';
};
scopes = mkOption {