Get ksm metrics for Mackerel

ksm_metrics.sh

#!/bin/bash

DATE=$(date +%s)

echo -e "ksm.pages_volatile\t$(cat /sys/kernel/mm/ksm/pages_volatile)\t${DATE}"
echo -e "ksm.pages_shared\t$(cat /sys/kernel/mm/ksm/pages_shared)\t${DATE}"
echo -e "ksm.pages_sharing\t$(cat /sys/kernel/mm/ksm/pages_sharing)\t${DATE}"
echo -e "ksm.pages_unshared\t$(cat /sys/kernel/mm/ksm/pages_unshared)\t${DATE}"

mackerel-agent.conf

# Please append this lines to your config file.
[plugin.metrics.ksm]
command = "/usr/local/bin/ksm_metrics.sh"
type = "metric"