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I notice your code has a lot of repetition. Generally, whenever I see repetition in code, that tells me I can probably reduce some of it to a function or iteration:

my %check_oids = (
   sysUpTime   => '1.3.6.1.2.1.1.3.0',
   sysDescr    => '1.3.6.1.2.1.1.1.0',
   sysObjectID => '1.3.6.1.2.1.1.2.0',
   sysContact  => '1.3.6.1.2.1.1.4.0',
   sysName     => '1.3.6.1.2.1.1.5.0',
   sysLocation => '1.3.6.1.2.1.1.6.0',
   sysServices => '1.3.6.1.2.1.1.7.0',
);

foreach (keys %check_oids) {
   my $result = $session->get_request(
      -varbindlist => [$check_oids{$_}]
   );

   if (!defined($result)) {
      printf("ERROR: %s.\n", $session->error);
      $session->close;
      exit 1;
   }

   printf("%s for host '%s' is %s\n", $_,
      $session->hostname, $result->{$check_oids{$_}} 
   );
}
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