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 my $ams_hosts = $request->get_config()->get_ams_hosts($domain);

print STDERR Dumper @{$ams_hosts};

$VAR1 = {
          'domainId' => '1',
...
          'deviceType' => 3,
          'deviceName' => 'ams_57'
        };

my %ams_ips_hash = map {$_->{'deviceIp'}++} @{$ams_hosts};
$ams_ip = "" if !exists $ams_ips_hash{ $ams_ip};