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Domain Monitoring

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Overview

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Supported Protocols

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HTTP/HTTPS Monitoring

• Uptime Checks: Checks if your website is reachable
• Response Time Monitoring: Measures loading times
• Status Code Monitoring: Monitors HTTP status codes
• Content Validation: Optionally check for specific content

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SSL Certificate Monitoring

• Expiration Warnings: Automatic notifications for expiring certificates
• Certificate Chain Validation: Checks complete certificate chain
• Security Analysis: Detects weak encryption or configurations

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DNS Monitoring

• Record Changes: Detects changes in DNS records
• Propagation Monitoring: Checks DNS propagation worldwide
• Name Server Health: Monitors health of name servers

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Monitoring Locations

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Primary Locations

• Amsterdam, Netherlands (Default)
• London, UK
• Frankfurt, Germany
• New York, USA
• San Francisco, USA
• Singapore
• Sydney, Australia

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Enterprise Locations (Paid)

• Tokyo, Japan
• São Paulo, Brazil
• Mumbai, India
• Cape Town, South Africa

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Notification Triggers

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Automatic Alerts

• Domain Down: When website is unreachable
• Slow Response: When response time exceeds threshold
• SSL Expiring: 30 days before certificate expires
• SSL Expired: When certificate has expired
• DNS Changes: Upon detection of DNS record changes
• Content Missing: When expected content is not found

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Severity Levels

• Critical: Domain down, SSL expired
• Warning: Slow response, SSL expiring soon
• Info: DNS changes, minor issues

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Response Time Monitoring

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Metrics Collected

• Time to First Byte (TTFB): Time until first byte received
• Total Response Time: Total loading time
• DNS Lookup Time: DNS resolution time
• TCP Connect Time: TCP connect time
• SSL Handshake Time: SSL handshake duration
• Content Transfer Time: Content transfer time

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Thresholds & Alerts

{
  "response_time_thresholds": {
    "warning": 2000,  // ms - gele alert
    "critical": 5000, // ms - rode alert
    "timeout": 30000  // ms - beschouw als down
  }
}

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SSL Monitoring Details

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Certificate Checks

• Expiration Date: Checks when certificate expires
• Issuer Validation: Verifies certificate authority
• Chain Completeness: Checks complete certificate chain
• Revocation Status: Checks CRL/OCSP for revocation
• Key Strength: Analyzes encryption strength

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Security Analysis

• Protocol Support: Checks supported TLS versions
• Cipher Suites: Analyzes used encryption methods
• HSTS Headers: Checks HTTP Strict Transport Security
• Certificate Transparency: Checks certificate transparency logs

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DNS Monitoring

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Record Types Monitored

• A Records: IPv4 addresses
• AAAA Records: IPv6 addresses
• CNAME Records: Canonical name records
• MX Records: Mail exchange servers
• TXT Records: Text records (SPF, DKIM, etc.)
• NS Records: Name servers

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Propagation Monitoring

• Global Checks: Checks DNS propagation worldwide
• Authoritative Servers: Checks primary name servers
• Cache Poisoning Detection: Detects DNS cache poisoning

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Website Change Detection

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Content Monitoring

• HTML Changes: Detects changes in page content
• Screenshot Comparison: Visual comparison of pages
• Structured Data: Checks JSON-LD and microdata
• SEO Elements: Monitor title, meta descriptions, headings

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Change Alerts

{
  "change_detection": {
    "enabled": true,
    "check_frequency": 3600, // elke uur
    "alert_on_changes": true,
    "capture_screenshots": true,
    "ignore_selectors": [".timestamp", "#random-content"]
  }
}

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Performance Monitoring

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Core Web Vitals

• Largest Contentful Paint (LCP): Loading performance
• First Input Delay (FID): Interactivity
• Cumulative Layout Shift (CLS): Visual stability

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Additional Metrics

• Time to Interactive: When page becomes interactive
• Total Blocking Time: Time main thread is blocked
• Resource Load Times: Individual resource loading times

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Monitoring Intervals

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Standard Intervals (per Plan)

• Free: Every 10 minutes
• Pro: Every 5 minutes
• Enterprise: Every minute
• Custom: Configurable intervals (30 seconds minimum)

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Dynamic Intervals

• Incident State: Every minute during incidents
• Recovery Monitoring: More intensive checks during recovery
• Scheduled Maintenance: Customized intervals during maintenance

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Data Retention

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Metrics Data

• Raw Data: 90 days (Pro), 1 year (Enterprise)
• Aggregated Data: 2 years (all plans)
• Incident Data: Unlimited

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Screenshot Storage

• Change Detection Screenshots: 30 days
• Incident Screenshots: 1 year
• Manual Screenshots: 1 year

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API Integration

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REST API Endpoints

# Get domain list
GET /api/domains

# Domain details
GET /api/domains/{id}

# Domain metrics
GET /api/domains/{id}/metrics?period=24h

# Add domain
POST /api/domains

# Update domain
PUT /api/domains/{id}

# Delete domain
DELETE /api/domains/{id}

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Webhook Events

{
  "event": "domain_down",
  "domain": {
    "id": "domain-123",
    "url": "https://example.com",
    "status": "down",
    "response_time": null,
    "error": "Connection timeout",
    "timestamp": "2024-01-17T10:30:00Z"
  }
}

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Troubleshooting

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Common Problems

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”Domain Always Down”

• Check firewall settings
• Verify DNS records
• Check if domain is publicly reachable

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”False Positive Alerts”

• Increase timeout value
• Set expected status codes
• Configure content validation

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”SSL Certificate Issues”

• Check certificate chain
• Verify intermediate certificates
• Check certificate transparency logs

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”Slow Response Times”

• Analyze server performance
• Check CDN configuration
• Monitor database query performance

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Debug Tools

• Manual Check: Test domain via toolbox
• SSL Checker: Analyze certificate details
• DNS Lookup: Check DNS configuration
• Port Scanner: Verify network connectivity

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Best Practices

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Optimal Configuration

1. Set Realistic Thresholds: Prevent false positives
2. Use Multiple Locations: For better availability detection
3. Configure Maintenance Windows: Prevent alerts during maintenance
4. Monitor Core Web Vitals: For better user experience
5. Set Up Escalation: For critical systems

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Alert Management

1. Use Severity Levels: Prioritize alerts
2. Set Digest Notifications: Avoid alert fatigue
3. Configure On-call Rotation: For 24/7 coverage
4. Document Runbooks: For fast incident response

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Performance Optimization

1. Monitor Resource Usage: CPU, Memory, Disk
2. Implement Caching: For better response times
3. Use CDN: For global performance
4. Optimize Images: For faster page loads