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<conf name="snoopdogg" serial="1" target="172.16.1.3">
 <services>
...
       <crit value="10" operator="&gt;"/>
     </probe>
(...)

my $configuration = $xml->XMLin(
             $conf,
...
                        },
             KeepRoot => 0
);

my $warn = $configuration->{snoopdogg}{services}{cpu}{plugins}{cpu}{pr
+obes}{load1}{warn}{value};

my $warn = $configuration->{snoopdogg}{cpu}{cpu}{load1}{warn}{value};

GroupTags => { services => 'service' => name }