#!/bin/bash
# disk-free.sh — free space on /
URL='YOUR_URL/disk'
FREE_GB=$(df -BG / | awk 'NR==2 {gsub("G","",$4); print $4}')
TOTAL_GB=$(df -BG / | awk 'NR==2 {gsub("G","",$2); print $2}')
USED_PCT=$(df / | awk 'NR==2 {gsub("%","",$5); print $5}')
curl -fsS -m 15 -H 'Content-Type: application/json' \
  --data-raw "{\"hostname\": \"$(hostname)\", \"free_gb\": $FREE_GB, \"total_gb\": $TOTAL_GB, \"used_pct\": $USED_PCT}" \
  "$URL"