uptimetracker

A lightweight HTTP uptime monitor written in Go. Checks a list of URLs at a configurable interval, logs results, and sends Discord alerts on state changes.

Features

• Checks multiple targets concurrently
• Alerts on DOWN and recovery via Discord webhook (fires once per state change, no spam)
• Logs to file and stdout simultaneously

Configuration

Copy config.json.example as config.json and edit it:

{
  "interval_seconds": 30,
  "discord_webhook": "https://discord.com/api/webhooks/...",
  "log_file": "uptimetracker.log",
  "targets": [
    { "name": "My Site", "url": "https://example.com" }
  ]
}

Field	Required	Description
targets	yes	List of sites to monitor
interval_seconds	no	Check frequency, defaults to 60
discord_webhook	no	Discord webhook URL for alerts
log_file	no	Log file path, defaults to uptimetracker.log

Usage

go build -o uptimetracker .
./uptimetracker             # uses config.json in current directory
./uptimetracker /path/to/config.json

Output:

2026-02-25 18:00:00  started monitoring 1 target(s) every 30s
2026-02-25 18:00:00  My Site  UP    200  45ms
2026-02-25 18:00:30  My Site  DOWN  503  120ms
2026-02-25 18:00:30  alert sent: My Site is DOWN

Deploy with systemd

Build a Linux binary:

GOOS=linux GOARCH=amd64 go build -o uptimetracker .

Copy to your server:

scp uptimetracker config.json uptimetracker.service user@your-vps:~/uptimetracker/

Install and start the service:

# Update User= and paths in the service file to match your username
sudo cp ~/uptimetracker/uptimetracker.service /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl enable --now uptimetracker

View logs:

sudo journalctl -fu uptimetracker