/usr/share/munin/plugins/open_files is in munin-plugins-core 2.0.25-1+deb8u3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | #!/bin/sh
# -*- sh -*-
: << =cut
=head1 NAME
open_files - Plugin to monitor the number of open files in the system
=head1 CONFIGURATION
No configuration
=head1 AUTHOR
Unknown author
=head1 LICENSE
GPLv2
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=cut
. $MUNIN_LIBDIR/plugins/plugin.sh
if [ "$1" = "autoconf" ]; then
if [ -r /proc/sys/fs/file-nr ]; then
echo yes
exit 0
else
echo no
exit 0
fi
fi
if [ "$1" = "config" ]; then
echo 'graph_title File table usage'
echo 'graph_args --base 1000 -l 0'
echo 'graph_vlabel number of open files'
echo 'graph_category system'
echo 'graph_info This graph monitors the Linux open files table.'
echo 'used.label open files'
echo 'used.info The number of currently open files.'
computed_warning=$(awk '{printf "%d", $3*0.92}' < /proc/sys/fs/file-nr)
computed_critical=$(awk '{printf "%d", $3*0.98}' < /proc/sys/fs/file-nr)
p_warning=$(print_warning used)
p_critical=$(print_critical used)
[ -z "$p_warning" ] && echo "used.warning $computed_warning" || echo $p_warning
[ -z "$p_critical" ] && echo "used.critical $computed_critical" || echo $p_critical
echo 'max.label max open files'
echo 'max.info The maximum supported number of open files. Tune by modifying /proc/sys/fs/file-max.'
print_warning max
print_critical max
exit 0
fi
awk '{print "used.value " $1-$2 "\nmax.value " $3}' < /proc/sys/fs/file-nr
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