n8n Workflow: Domain, SSL & Uptime Monitoring with Telegram

Never miss an expiring domain, SSL certificate, or downtime event—automatically

This n8n workflow checks every monitored website once per day for domain expiry (RDAP), SSL certificate expiry (via nslookup.io), and HTTP uptime—then sends priority-based alerts to Telegram and compiles a weekly health summary.

What this workflow does

• Runs daily at 7:00 AM on a scheduled trigger.
• Builds a TLD → RDAP server map by fetching the IANA RDAP bootstrap file, ensuring the workflow resolves the correct registry lookup endpoint.
• Reads monitored sites from a Google Sheets “sites” tab and processes each one in turn.
• Checks domain expiry using RDAP.
• Checks SSL certificate expiry by querying days-until-expiry through nslookup.io.
• Performs an HTTP request to determine uptime status.
• Calculates the highest alert tier across domain, SSL, and uptime results, and applies a minimum alert threshold based on each site’s configured priority.
• Sends a formatted Telegram message when an alert is required and appends incident details to a Google Sheets “history” tab.
• Sends a weekly Telegram digest on the configured weekday when weekly summaries are enabled.

Use cases

• Website and SaaS operators who need proactive monitoring of domain, SSL, and uptime with actionable Telegram notifications.
• Automation engineers who want an n8n monitoring workflow backed by Google Sheets as the source of truth.
• Teams that need a weekly endpoint health summary for visibility and reporting.

Technical details

• n8n nodes/blocks: if, set, code, no op, telegram, sticky note.
• Telegram integration: uses a BotFather token and a configured chat ID for alerts and weekly digests.
• Google Sheets: OAuth2 credentials with required sites and history tabs/headers.
• RDAP: fetches IANA RDAP bootstrap data to resolve correct TLD registry endpoints.
• SSL checks: queries expiry timing via nslookup.io.