A small script to notify via telegram if the storage on a linux server runs low. Tested on Ubuntu.

storagealert.sh

#!/bin/bash

# Telegram Bot API Token and Chat ID
TELEGRAM_API_TOKEN="YOUR_TELEGRAM_BOT_API_TOKEN"
CHAT_ID="YOUR_CHAT_ID"

# Set the threshold for used storage in percentage
THRESHOLD=85

# Function to check used storage
check_storage() {
    # Get the used storage in percentage
    used_percent=$(df -h / | awk 'NR==2 {print $5}' | sed 's/%//')

    # Check if used storage is above the threshold
    if [ "$used_percent" -gt "$THRESHOLD" ]; then
        message="⚠️ High storage usage alert! Used storage is at ${used_percent}%"
        send_telegram_message "$message"
    fi
}

# Function to send a message via the Telegram API
send_telegram_message() {
    local message="$1"

    curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_API_TOKEN}/sendMessage" \
        -d "chat_id=${CHAT_ID}" \
        -d "text=${message}" \
        > /dev/null
}

# Main script
check_storage

exit 0