サーバヒットポイントが0以下になったらシャットダウンする(見た目だけ)

attack.sh

#!/bin/bash

hp=$(curl -s -X GET \
  -H "X-Api-Key: $MACKEREL_APIKEY" \
  https://mackerel.io/api/v0/hosts/$MACKEREL_HOSTID/metadata/HP | jq -r .HP)
damage=$(expr $RANDOM % 500)
remaining_hp=$(expr $hp - $damage)
hostname=$1

echo HP is $hp
echo $damage damage!
echo remaining HP is $remaining_hp

if [ $remaining_hp -le 0 ]; then
  echo
  ssh $hostname 'echo $(hostname) is shutting down...'
  curl -s -X PUT \
    -H "X-Api-Key: $MACKEREL_APIKEY" \
    -H "Content-Type:application/json" \
    -d "{\"HP\": \"999\"}" \
    https://mackerel.io/api/v0/hosts/$MACKEREL_HOSTID/metadata/HP > /dev/null
else
  curl -s -X PUT \
    -H "X-Api-Key: $MACKEREL_APIKEY" \
    -H "Content-Type:application/json" \
    -d "{\"HP\": \"$remaining_hp\"}" \
    https://mackerel.io/api/v0/hosts/$MACKEREL_HOSTID/metadata/HP > /dev/null
fi

see https://ghost.ponpokopon.me/enjoy-mackerel-metadata/