Open Source Server Monitoring Tool & Website Uptime Monitoring in Go

Enterprise website uptime monitoring doesn't have to be expensive or complex. Learn how a lightweight Go binary helps you detect downtime before clients report it — with multi-site health checks, Slack alerts, and Prometheus metrics in a single binary.

When your team lacks proper downtime detection, every outage costs more than it should:

• ›Client trust erodes — every minute of unmonitored downtime is a minute your client wonders why you have not fixed it yet
• ›Engineer time wasted — context-switching from planned work to firefighting destroys team velocity
• ›SLAs breached — undetected outages eat into your uptime guarantees and may trigger contractual penalties
• ›Revenue lost — for e-commerce and SaaS, every second of downtime carries a direct dollar cost

Organizations need a server monitoring tool that alerts them before the client picks up the phone.

Enterprise environments come with constraints. Here is how common solutions compare:

What most teams actually need is dead simple: ping a list of URLs every N seconds, alert the right people when something fails, and get out of the way. No agents. No SaaS dependency. No per-host fees.

Server Monitor Tool is an open source, single-binary uptime monitoring tool written in Go. It does one thing well:

monitor start

That is it. It reads a YAML config file, runs health checks against each site at your configured interval, and displays a live terminal dashboard. When a site goes down, it fires alerts via email, Slack, or a custom webhook.

Why Go for Server Monitoring?

One binary. Zero runtime dependencies. Cross-compile for Linux and macOS in seconds. Copy it to any server with scp and it runs immediately. For operations teams who do not want to babysit a full monitoring stack, Go is the ideal choice.

Multi-Site Health Checks

Define as many endpoints as you need — internal apps, client sites, APIs, and databases all in one YAML file:

sites:
  - name: Client Dashboard
    url: https://client.example.com
    expect_status: 200
  - name: Internal API
    url: https://api.internal.example/health
    expect_status: 200
  - name: Payment Gateway
    url: https://payments.example.com/status
    method: GET
    expect_status: 200

Flexible Alerting

Prometheus Metrics Export

Feed /metrics into your existing observability stack:

• ›monitor_checks_total{site, status} — check volume grouped by status
• ›monitor_check_duration_seconds{site} — per-site latency tracking over time
• ›monitor_uptime_seconds — process uptime for parent health monitoring

Real-Time TUI Dashboard

See every site status at a glance — green for healthy, yellow for degraded, red for down. No browser required. No dashboard fatigue from yet another web UI.

One-Line Install (Recommended)

curl -fsSL https://raw.githubusercontent.com/Rojeets/ServerMonitorTool/v0.1.0/install.sh | bash

The installer detects your OS and CPU architecture, downloads the correct binary, and creates a starter config.yaml from the example template.

Manual Binary Install

# Linux x86_64
sudo wget -O /usr/local/bin/monitor \
  https://github.com/Rojeets/ServerMonitorTool/releases/download/v0.1.0/monitor_linux_amd64
sudo chmod +x /usr/local/bin/monitor

# macOS ARM64
sudo wget -O /usr/local/bin/monitor \
  https://github.com/Rojeets/ServerMonitorTool/releases/download/v0.1.0/monitor_darwin_arm64
sudo chmod +x /usr/local/bin/monitor

Docker Deployment

docker build -t server-monitor .
docker run --rm -v $(pwd)/config.yaml:/config.yaml:ro server-monitor start

interval: 30s       # how often to check each site
timeout: 10s        # per-request timeout
retries: 3          # failed attempts before declaring downtime
slow_threshold: 5s  # response times above this are flagged degraded

sites:
  - name: Google
    url: https://www.google.com
    expect_status: 200

smtp:
  enabled: true
  host: smtp.gmail.com
  port: 587
  username: "YOUR_EMAIL"
  password: "YOUR_APP_PASSWORD"
  from: monitor@example.com
  to:
    - admin@example.com

webhooks:
  slack:
    enabled: true
    webhook_url: "https://hooks.slack.com/services/..."
    channel: "#alerts"

The retries field is especially important — it eliminates false positives from transient network blips so your team is paged only for real outages.

Since deploying this server monitoring tool, teams using it report:

• ›Detection time: from client-reported (30–60 min) to sub-minute automated detection
• ›False positives: near zero — configurable retries filter out transient glitches
• ›Engineer overhead: roughly 5 minutes to set up, zero ongoing maintenance
• ›Client satisfaction: teams now call clients before clients call them

• ›Status page generator — share a public status page directly with clients
• ›PagerDuty integration — first-class incident management workflow
• ›Multi-region checks — monitor services from multiple geographic vantage points
• ›HTTP method support — POST, PUT, and custom header checks for API monitoring

Stop waiting for clients to tell you your servers are down. Install Server Monitor Tool in under one minute:

curl -fsSL https://raw.githubusercontent.com/Rojeets/ServerMonitorTool/v0.1.0/install.sh | bash

Or visit the GitHub repository for full documentation, issue tracking, and community contributions.