post-mackerel-alerts-count.sh

#!/bin/bash

MACKEREL_APIKEY=<YOUR_MACKEREL_APIKEY>
SERVICE_NAME="alerts-count"
NOW=$(date +%s)
ALERT_LOG_FILE="/path/to/logfile"

function push_mackerel_alerts_count () {
  curl -sS \
      -X POST \
      -H 'X-Api-Key: '${MACKEREL_APIKEY} \
      -H 'Content-Type: application/json' \
      -d '[{"name":"'$1'","time":'$NOW',"value":'$2'}]' \
      https://api.mackerelio.com/api/v0/services/alerts-count/tsdb
}

cat $ALERT_LOG_FILE | cut -f 4 | sort | uniq -c | while read LINE
do
  TYPE="alerts_count."$(echo "$LINE" | cut -d' ' -f 2)
  COUNT=$(echo "$LINE" | cut -d' ' -f 1)
  push_mackerel_alerts_count $TYPE $COUNT
done