contrib-munin/plugins/other/tcp-retransmissions

#!/bin/bash

case $1 in
    config)
        cat <<EOF
graph_title TCP retransmissions
graph_vlabel Rate, retrs/sockets
graph_category network
graph_info dynamic TCP socket retransmission counters
rate.label Retransmission rate
rate.draw LINE2
EOF

	exit 0
        ;;
    autoconf)
        if [ -f /proc/net/tcp -o -f /proc/net/tcp6 ]
        then
            echo yes
            exit 0
        else
            echo no
            exit 1
        fi
esac

cat /proc/net/tcp* | awk '
{
	TOTAL += $7;
	COUNT++;
}

END {
	printf "rate.value %.3f\n", TOTAL/COUNT
}
'