/usr/share/munin/plugins/nfsd 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.
| 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 | #!/bin/sh
# -*- sh -*-
: << =cut
=head1 NAME
nfsd - Plugin to monitor NFS server activity
=head1 CONFIGURATION
No configuration
=head1 AUTHORS
Plugin created by Alexandre Dupouy, with the assistance of Mike Fedyk
=head1 LICENSE
Unknown license
=head1 MAGIC MARKERS
 #%# family=auto
 #%# capabilities=autoconf
=cut
NFSD=/proc/net/rpc/nfsd
proc="getattr setattr lookup access readlink read write create mkdir symlink mknod remove rmdir rename link readdir readdirplus fsstat fsinfo pathconf commit"
if [ "$1" = "autoconf" ]; then
	if [ -f "$NFSD" ]; then
		echo yes
		exit 0
	else
		echo "no (no $NFSD)"
		exit 0
	fi
fi
if [ "$1" = "config" ]; then
	echo 'graph_title NFS Server'
	echo 'graph_args --base 1000 -l 0'
	echo 'graph_vlabel requests / ${graph_period}'
	echo 'graph_total total'
	echo 'graph_category NFS'
	for a in $proc ; do echo "$a.label $a" ; echo "$a.type DERIVE"; echo "$a.min 0"; done
	exit 0
fi
awk '/proc3/ {
    split("'"$proc"'", names)
    split($0,values)
    for (e in names)
        printf("%s.value %d\n", names[++i], values[i+3]);
  }' $NFSD
 |