/usr/share/munin/plugins/sendmail_mailqueue is in munin-node 1.4.6-3ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# -*- sh -*-
: << =cut
=head1 NAME
sendmail_mailqueue - Plugin to graph the sendmail queue size
=head1 CONFIGURATION
This plugin uses the following configuration variables
[sendmail_mailqueue]
env.mspqueue - MSQ queue directory
env.mtaqueue - MTA queue directory
=head2 DEFAULT CONFIGURATION
The default configuration is
[sendmail_mailqueue]
env.mspqueue /var/spool/mqueue-client
env.mtaqueue /var/spool/mqueue
=head1 AUTHOR
Unknown author
=head1 LICENSE
Unknown license
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=cut
MSP_QUEUE=/var/spool/mqueue-client
MTA_QUEUE=/var/spool/mqueue
if [ "$mspqueue" ]; then MSP_QUEUE=$mspqueue ; fi
if [ "$mtaqueue" ]; then MTA_QUEUE=$mtaqueue ; fi
if [ "$1" = "autoconf" ]; then
if [ -d ${MSP_QUEUE} -a -d ${MTA_QUEUE} ] ; then
echo yes
exit 0
else
echo no
exit 0
fi
fi
if [ "$1" = "config" ]; then
echo 'graph_title Sendmail queued mails'
echo 'graph_order mails'
echo 'graph_vlabel mails in queue'
echo 'graph_category sendmail'
echo 'mails.label mails'
exit 0
fi
# Append /. to directory to force following symlinks at the start
# point.
mspmails=$(find ${MSP_QUEUE}/. -type f -name '[qQ]*' 2>/dev/null | fgrep -v '.hoststat' | wc -l)
mtamails=$(find ${MTA_QUEUE}/. -type f -name '[qQ]*' 2>/dev/null | fgrep -v '.hoststat' | wc -l)
echo "mails.value `expr ${mspmails} + ${mtamails}`"
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