plugin postfix_mailvolume invalid output when log file missing

Package: munin-node
Version: 1.4.5-1ubuntu2 (and earlier)

Given:

Host has no /var/log/syslog file

Error output:

 [WARNING] munin_set_var_loc: Setting unknown option 'value' at <removed for security>;<removed for security>;postfix_mailvolume;delivered:

Issue:

Default log file does not exist and no override logfile set results in invalid output (wrong name label)

Default log file:
my $LOGDIR = $ENV{'logdir'} || '/var/log';
my $LOGFILE = $ENV{'logfile'} || 'syslog';

Graph config callout:

if ( $ARGV[0] and $ARGV[0] eq "config" ) {
    print "graph_title Postfix bytes throughput\n";
    print "graph_args --base 1000 -l 0\n";
    print "graph_vlabel bytes / \${graph_period}\n";
    print "graph_scale yes\n";
    print "graph_category postfix\n";
    print "volume.label throughput\n";
    print "volume.type DERIVE\n";
    print "volume.min 0\n";
    exit 0;
}

Output on log file missing:

if (! -f $logfile) {
    print "delivered.value U\n";
    exit 1;
}

Fix:

s/delivered.value/volume.value/

Diff: (file: /usr/share/munin/plugins/postfix_mailvolume)

if (! -f $logfile) {
- print "delivered.value U\n";
+ print "volume.value U\n";
    exit 1;
}

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: munin-node 1.4.5-1ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
Uname: Linux 2.6.35-24-generic x86_64
Architecture: amd64
Date: Wed Jun 22 11:57:00 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: munin