Website Downtime Alert via LINE + Supabase Log

This workflow automatically checks the status of your websites using UptimeRobot API. If any site is down or unstable, it will:

• Generate a natural-language alert message using GPT-4o
• Push the message to a LINE group (with funny IT-style encouragement)
• Log all DOWN status entries into your Supabase database
• Wait 30 minutes before repeating

🔧 How It Works

1. Schedule Trigger – Runs on a fixed interval (every few minutes).
2. UptimeRobot Node – Fetches website monitor data.
3. Code Node (Filter) – Filters only websites with status 8 (may be down) or 9 (down).
4. IF Node – If any site is down, proceed.
5. LangChain LLM Node – Formats alert with a humorous message using GPT-4o.
6. Line Notify (HTTP Request) – Sends the alert to your LINE group.
7. Loop Over Items – Loops through all monitors.
8. Filter Down (Status = 9) – Selects only “fully down” sites.
9. Supabase Node – Logs these into synlora_uptime_down table.
10. Wait Node – Delays next alert by 30 minutes to avoid spamming.

⚙️ Setup Steps

Required:

• 🔗 UptimeRobot API Key
• 📲 LINE Channel Access Token and Group ID
• 🧠 OpenAI Key (GPT-4o Mini)
• 🗃️ Supabase Project & Table

Step-by-step:

1. Go to UptimeRobot → Get API key and ensure monitors are set up.
2. Create a Supabase table with fields: website, status, uptime_id.
3. Create a LINE Messaging API bot, join it to your group, and get: 1. Access Token 2. Group ID (userId or groupId)
4. Add your OpenAI API Key for GPT-4o Mini (or switch to your preferred LLM).
5. Import the workflow JSON into n8n.
6. Set credentials in all necessary nodes.
7. Activate the workflow.