This requires that `ifstat`, `sysstat` and `bc` are installed and that `$LIBRATO_USER` and `$LIBRATO_TOKEN` are available in the environment.

send_system_stats.sh

#!/bin/bash

hostname=$(hostname)

# Run top twice, first output is cached
top_out=$(top -bn2 -d0.1)

cpu=$(echo "${top_out}" | grep "Cpu(s)" | sed -E "s/.*,\s*([0-9\.]+)\%id.*/\1/" | awk '{print 100 - $1}' | sed -n 2p)

memory_total=$(echo "${top_out}" | grep "Mem:" | awk {'print $2'} | sed s/k// | sed -n 2p)
memory_used=$(echo "${top_out}" | grep "Mem:" | awk {'print $4'} | sed s/k// | sed -n 2p)
memory_percent=$(echo ${memory_used}/${memory_total} | bc -l | cut -c 2-3)

disk=$(df -hl | sed -n 2p | awk {'print $5'} | sed s/%//)

disk_read=$(iostat -dm | awk 'NR > 3' | awk '{s=s+$3}; END{print s}')
disk_write=$(iostat -dm | awk 'NR > 3' | awk '{s=s+$4}; END{print s}')

curl -u ${LIBRATO_USER}:${LIBRATO_TOKEN}        \
-d "gauges[0][name]=system.${hostname}.cpu"     \
-d "gauges[0][value]=${cpu}"                    \
-d "gauges[0][source]=${hostname}"              \
-d "gauges[1][name]=system.${hostname}.memory"  \
-d "gauges[1][value]=${memory_percent}"         \
-d "gauges[1][source]=${hostname}"              \
-d "gauges[2][name]=system.${hostname}.disk"    \
-d "gauges[2][value]=${disk}"                   \
-d "gauges[2][source]=${hostname}"              \
-d "gauges[3][name]=system.${hostname}.disk_io" \
-d "gauges[3][value]=${disk_read}"              \
-d "gauges[3][source]=read"                     \
-d "gauges[4][name]=system.${hostname}.disk_io" \
-d "gauges[4][value]=${disk_write}"             \
-d "gauges[4][source]=write"                    \
-X POST https://metrics-api.librato.com/v1/metrics