Monitor disk space

monitor-disk.sh

#!/usr/bin/env bash
set -e

HEALTHCHECKS_URL="https://hc-ping.com/<id>"
BOT_TOKEN="<telegram-bot-token>"
CHAT_ID="<telegram-chat-id>"

send_telegram_message() {
    local message="$1"
    curl -s -X POST "https://api.telegram.org/bot$BOT_TOKEN/sendMessage" \
        -d chat_id="$CHAT_ID" \
        -d text="$message" \
        -d parse_mode="HTML"
}

DISK_THRESHOLD=10
IGNORE_FS="tmpfs|devtmpfs|efivarfs" # Filesystems to ignore

check_disk_utilization() {
    df -h | grep -vE "^Filesystem|${IGNORE_FS}" | while read -r line; do
        filesystem=$(echo "$line" | awk '{print $1}')
        mount_point=$(echo "$line" | awk '{print $6}')
        usage_percent=$(echo "$line" | awk '{print $5}' | sed 's/%//')

        if (( usage_percent > DISK_THRESHOLD )); then
            local message="🚨 <b>High Disk Usage Alert</b> 🚨%0A"
            message+="<b>Filesystem:</b> ${filesystem}%0A"
            message+="<b>Mount Point:</b> ${mount_point}%0A"
            message+="<b>Usage:</b> ${usage_percent}%%0A"

            send_telegram_message "$message"
        fi
    done
}

check_disk_utilization

curl -fsS -m 10 --retry 5 -o /dev/null "$HEALTHCHECKS_URL"