Site Health Monitor

Monitor one or more websites for health issues. Detect downtime, expiring SSL certs, slow responses, and content changes — then report or alert.

Quick Check (Single URL)

When user asks to check a single URL right now:

1. Run scripts/check_site.sh \x3Curl>
2. Parse the JSON output
3. Present a formatted health report

Monitored Sites Config

For ongoing monitoring, maintain a config at user's chosen location (default: ~/.openclaw/workspace/site-monitor.json):

{
  "sites": [
    {
      "url": "https://example.com",
      "name": "Main Site",
      "checks": ["uptime", "ssl", "response_time", "content"],
      "alert_threshold_ms": 3000,
      "ssl_warn_days": 14,
      "content_selector": "title"
    }
  ],
  "defaults": {
    "checks": ["uptime", "ssl", "response_time"],
    "alert_threshold_ms": 5000,
    "ssl_warn_days": 30
  }
}

Health Checks

1. Uptime

• HTTP GET to URL
• Pass: 2xx/3xx status
• Warning: 4xx status
• Fail: 5xx, connection refused, timeout (>10s)

2. SSL Certificate

• Run scripts/check_ssl.sh \x3Cdomain>
• Pass: Valid, >30 days to expiry
• Warning: \x3C30 days to expiry (configurable)
• Fail: Expired, self-signed, or missing

3. Response Time

• Measure TTFB + transfer via scripts/check_site.sh
• Pass: Under threshold (default 5000ms)
• Warning: 1-2x threshold
• Fail: >2x threshold or timeout

4. Content Changes (Planned)

• Fetch page, extract text, hash it
• Compare against stored hash
• Report if content changed since last check
• Note: This feature is planned for v1.1

Reports

Single Site

## 🟢 example.com — Healthy
| Check         | Status | Detail                    |
|---------------|--------|---------------------------|
| Uptime        | ✅ UP  | 200 OK (143ms)            |
| SSL           | ✅ OK  | Expires in 87 days        |
| Response Time | ✅ OK  | 342ms (threshold: 5000ms) |
| Content       | — Same | No changes detected       |

Multi-Site Summary

## Site Health — 2026-03-26
| Site       | Status | Issues         |
|------------|--------|----------------|
| example.com| 🟢 OK | —              |
| api.foo.io | 🟡 WARN| SSL: 12 days  |
| shop.bar   | 🔴 DOWN| 503 error     |

Alerts

Alert when: site DOWN, SSL within warning window, response >2x threshold, 2+ consecutive failures.

Format: ⚠️ [site] — [issue]. [detail]. Checked at [time].

Scheduled Monitoring

Suggest cron job for recurring checks (30-60 min interval for production). Store last 100 results per site in ~/.openclaw/workspace/.site-monitor-history.json.

Scripts

• scripts/check_site.sh \x3Curl> — HTTP health check, outputs JSON (status, timing, headers)
• scripts/check_ssl.sh \x3Cdomain> — SSL cert check, outputs JSON (issuer, expiry, days remaining)