Monitor SSL certificate expiries with Google Sheets, Slack and Linear

by Monfort N. Brian | 宁俊 ✓ · 9 views · created 2026-04-26 · SecOps

What this workflow does

This workflow has 9 nodes and runs on a schedule (cron 0 8 * * *). Along the way it connects Google Sheets, Slack and Linear.

How it runs

Trigger: On a schedule (cron 0 8 * * *).

1. Read Domains from Sheets (Google Sheets): uses Google Sheets
2. Check SSL Certificate Expiry (Code): runs custom JavaScript code
3. Filter Expiring Certs (Code): runs custom JavaScript code
4. Classify Alert Severity (Code): runs custom JavaScript code
5. Post Alert to Slack (Slack): uses Slack
6. Filter High Priority Alerts (Code): runs custom JavaScript code
7. Create Issue in Linear (Linear): uses Linear
8. Append Alert Log to Sheets (Google Sheets): append or update

Services it uses

Google SheetsSlackLinear

Before you upgrade to n8n 3.0

Nodes used (5)

• Schedule Triggern8n-nodes-base.scheduleTrigger
• Coden8n-nodes-base.code
• Google Sheetsn8n-nodes-base.googleSheets
• Slackn8n-nodes-base.slack
• Linearn8n-nodes-base.linear

From the author

How it works 8AM daily trigger - Read domains from Google Sheet - Check each domain's SSL certificate - Filter: only domains expiring within 30 days or already expired - Classify severity (expired / critical / warning / notice) - Send one digest message to…

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