Errno Documentation
Everything you need to monitor your websites, set up alerts, and keep your services running 24/7
Quick Start
Get started in minutes
Monitoring
Track uptime & metrics
Alerts
Discord notifications
Status Pages
Public service status
Getting Started
Start monitoring in under 2 minutes
1. Create Your Account
Sign in with Discord to get instant access to the monitoring dashboard.
Click "Login with Discord"
Find it in the navigation bar
Authorize Errno
Grant basic permissions
Free Plan Included
All new accounts start with our Free plan - monitor up to 5 websites with 5-minute check intervals at no cost.
2. Add Your First Website
Start monitoring any website in just a few clicks.
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1
Navigate to Dashboard
Click the "Add Website" button in the header
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2
Enter Website Details
URL (including http:// or https://), friendly name, and check interval
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3
Save & Monitor
First check runs immediately, then continues at your chosen interval
Pro Tip
You can manually trigger checks anytime by clicking "Check Now" on the website details page.
Website Monitoring
Track uptime, response times & performance
How It Works
Errno automatically checks your websites at configured intervals and tracks key performance metrics.
Response Time
Measures how long your site takes to respond to requests
Uptime %
Percentage of successful checks over time period
Total Checks
Number of monitoring checks performed
Uptime Status Indicators
Excellent (Green) - ≥ 99% uptime
Your site is running smoothly with minimal issues
Warning (Amber) - 95-99% uptime
Some issues detected, monitor closely
Critical (Red) - < 95% uptime
Significant downtime detected, immediate action needed
Check Intervals & Plans
Free Plan
- 5 minute minimum interval
- Up to 5 websites
- 30 days of history
Discord Alerts
Get notified instantly about issues
Setup Discord Notifications
Receive real-time alerts about downtime, SSL expiry, and domain issues directly in your Discord server.
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1
Invite Errno Bot
Add the Errno bot to your Discord server with admin permissions
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2
Configure Notifications
Go to Dashboard → Discord and select your server and channel
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3
Enable Alert Types
Choose which events trigger notifications (downtime, recovery, SSL, domain)
Notification Types
When your website goes offline
When your website comes back online
When response time exceeds threshold
When SSL certificate is about to expire
When domain registration is about to expire
Notification Preferences
Customize notification cooldowns (default 1 hour) to prevent spam. Adjust slow response thresholds to match your needs.
SSL & Domain Tracking
Never miss an expiration date
SSL Certificate Monitoring
Errno automatically checks SSL certificates for HTTPS websites and alerts you before they expire.
Days Remaining
Status: Good
Days Remaining
Status: Warning
Days Remaining
Status: Critical
- Automatic SSL certificate expiry checking for HTTPS sites
- Self-signed certificates are accepted (won't cause failures)
- Discord alerts when certificates are expiring or expired
Domain Expiration Tracking
Track domain registration expiry dates using WHOIS/RDAP lookups to ensure you never lose your domain.
- Automatic WHOIS/RDAP lookups for domain expiry dates
- Manual refresh available from website details page
- Warnings at ≤30 days, critical alerts for expired domains
- Registrar information saved even if expiry date is unavailable
Note on Domain Lookups
Some domain registries return partial information. We'll save what's available (like registrar) even if the exact expiry date isn't provided.
Public Status Pages
Share your uptime with the world
Create Status Pages
Every monitored website gets a beautiful public status page automatically. Share it with your users to keep them informed.
https://errno.me/status/w/[website-id]
What's Included
Current Status
Real-time online/offline indicator
Uptime Percentage
7-day, 30-day, and 90-day stats
Response Time Graph
24-hour performance chart
SSL & Domain Info
Certificate and domain expiry dates
Recent Incidents
Last 7 days of downtime events
Average Response
Performance metrics
Premium: Custom Branding
Upgrade to Premium to customize your status pages with your own branding.
- Custom Logo - Add your company logo
- Custom Colors - Match your brand colors
- Custom Domain - Use your own domain
Plans & Limits
Free forever or upgrade for more power
Free Plan
Perfect for personal projects
- Up to 5 websites
- 5 minute check interval
- 30 days of monitoring history
- Discord notifications
- SSL & domain tracking
- Public status pages
Premium Plan
For professionals & teams
Also: $30/year (save 17%) or $99 lifetime
- Unlimited websites
- 1 minute check interval
- 90 days of monitoring history
- Priority Discord notifications
- Advanced SSL & domain checks
- Custom branded status pages
- API access (coming soon)
- Priority support
Frequently Asked Questions
Common questions answered
How often are checks performed?
Free plan allows 5-minute minimum intervals. Premium users can set intervals down to 1 minute for faster monitoring. You can adjust the interval anytime from your website settings.
How many websites can I monitor?
Free plan allows up to 5 websites. Premium plan offers unlimited website monitoring with faster check intervals and extended history storage.
How long is monitoring history kept?
Free plan keeps 30 days of monitoring history. Premium plan extends this to 90 days for deeper insights and trend analysis.
Do you follow redirects?
Yes, we follow up to 5 redirects automatically. SSL checks won't fail due to self-signed certificates.
What notifications will I receive?
You'll receive Discord notifications for:
- Downtime alerts (when your site goes offline)
- Recovery alerts (when your site comes back online)
- Slow response warnings
- SSL certificate expiring/expired
- Domain expiring/expired
You can customize thresholds and cooldowns in Dashboard → Discord → Notification Preferences.
Can I cancel my Premium subscription anytime?
Yes, you can cancel your monthly or yearly Premium subscription anytime. Your Premium features will remain active until the end of your billing period. Lifetime purchases are non-refundable.
Need Help?
Join our Discord community to get support, report bugs, suggest features, or just chat with other Errno users.
Join Discord Support Server