Mackerel カスタムメトリック inspired by ZabbixでMuninのMemoryグラフを再現する https://www.riscascape.net/archives/6588

mackerel.memory.sh

#!/bin/sh

if [ "$MACKEREL_AGENT_PLUGIN_META" = "1" ]; then
  /bin/cat << 'EOF';
# mackerel-agent-plugin
{
  "graphs": {
    "memory": {
      "label": "Memory usage - Munin style",
      "unit": "bytes",
      "metrics": [
        {"name": "available", "label": "Available", "stacked": false},
        {"name": "mem_total", "label": "MemTotal", "stacked": false},
        {"name": "swapd", "label": "Swapd", "stacked": true},
        {"name": "unused", "label": "UnUsed", "stacked": true},
        {"name": "buffers", "label": "Buffers", "stacked": true},
        {"name": "cached", "label": "Cached", "stacked": true},
        {"name": "swap_cache", "label": "SwapCached", "stacked": true},
        {"name": "slab_rec", "label": "SReclaimable", "stacked": true},
        {"name": "slab_unrec", "label": "SUnreclaim", "stacked": true},
        {"name": "page_tables", "label": "PageTables", "stacked": true},
        {"name": "apps", "label": "Apps", "stacked": true}
      ]
    }
  }
}
EOF

  exit
fi


TIMESTAMP=$(date "+%s")
TEXT=$(/bin/cat /proc/meminfo | /bin/grep -F -e 'MemTotal:' -e 'MemFree:' -e 'Buffers:' -e 'Cached:' -e 'Slab:' -e 'SReclaimable:' -e 'SUnreclaim:' -e 'PageTables:' -e 'SwapCached:' -e 'SwapTotal:' -e 'SwapFree:' | /bin/awk '{print $2 * 1024}'|/usr/bin/tr '\n' ',')

IFS=','
set -- $TEXT

MemTotal=$1
MemFree=$2
Buffers=$3
Cached=$4
SwapCached=$5
SwapTotal=$6
SwapFree=$7
Slab=$8
SReclaimable=$9
SUnreclaim=${10}
PageTables=${11}

available=$(/usr/bin/expr $MemFree + $Buffers + $Cached + $SReclaimable + $SwapCached)
apps=$(/usr/bin/expr $MemTotal - $MemFree - $Buffers - $Cached - $Slab - $PageTables - $SwapCached)
swap=$(/usr/bin/expr $SwapTotal - $SwapFree)

echo -e $(/bin/cat << EOF;
memory.mem_total\t$MemTotal\t$TIMESTAMP
memory.mem_available\t$mem_available\t$TIMESTAMP
memory.apps\t$apps\t$TIMESTAMP
memory.page_tables\t$PageTables\t$TIMESTAMP
memory.swap_cache\t$SwapCached\t$TIMESTAMP
memory.slab_rec\t$SReclaimable\t$TIMESTAMP
memory.slab_unrec\t$SUnreclaim\t$TIMESTAMP
memory.cached\t$Cached\t$TIMESTAMP
memory.buffers\t$Buffers\t$TIMESTAMP
memory.unused\t$MemFree\t$TIMESTAMP
memory.swapd\t$swap\t$TIMESTAMP
EOF
)
exit