Monitor SSL certificate expiries with Google Sheets, Slack and Linear

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1. Workflow Overview

How it works Set up steps Setup takes about 8–12 minutes . 1. Google Sheets Create a spreadsheet with two sheets or [download this](https://docs.google.com/spreadsheets/d/1aVLaF711Un6KVPbRfiyJqZxa1...

Best for

SecOps automation workflows
intermediate n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.scheduletrigger, n8n-nodes-base.code, n8n-nodes-base.googlesheets, n8n-nodes-base.slack, n8n-nodes-base.linear

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Monfort N. Brian | 宁俊.

Original n8n.io source

1.1 Workflow description

Title: Monitor SSL certificate expiries with Google Sheets, Slack and Linear
Workflow name: Monitor SSL certificate expiries with Google Sheets, Slack and Linear

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 Slack
- Create a Linear issue[or Jira ticket] per critical or expired domain
- Append all flagged domains to the logs sheet

Set up steps

Setup takes about 8–12 minutes.

1. Google Sheets

Create a spreadsheet with two sheets or download this:

Sheet 1 is called domains and sheet 2 logs

2. Import the workflow

Import this template into your n8n instance.

3. Connect credentials

You need three credentials:

Google Sheets
Slack
Linear API

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 2 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 3 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 4 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 5 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 6 - Every Day at 8 AM

Type / Role: n8n-nodes-base.scheduleTrigger - scheduleTrigger
Config choices: Version 1.3

Block 7 - Check SSL Certificate Expiry

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 8 - Read Domains from Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 9 - Classify Alert Severity

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 10 - Post Alert to Slack

Type / Role: n8n-nodes-base.slack - slack
Config choices: Version 2.4

Block 11 - Filter Expiring Certs

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 12 - Append Alert Log to Sheets

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 13 - Create Issue in Linear

Type / Role: n8n-nodes-base.linear - linear
Config choices: Version 1.1

Block 14 - Filter High Priority Alerts

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

3. Summary Table

Workflow	Monitor SSL certificate expiries with Google Sheets, Slack and Linear
Complexity	intermediate
Nodes	14
Categories	SecOps
Author	Monfort N. Brian \| 宁俊
Published	26 Apr 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15312/15312.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source SecOps workflows

Frequently asked questions

What does Monitor SSL certificate expiries with Google Sheets, Slack and Linear do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your SecOps use case.

Monfort N. Brian | 宁俊

7 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.scheduletrigger n8n-nodes-base.code n8n-nodes-base.googlesheets n8n-nodes-base.slack n8n-nodes-base.linear

Complexity

intermediate

Published 26 Apr 2026

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/15312/15312.json

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Monitor SSL certificate expiries with Google Sheets, Slack and Linear

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

How it works

Set up steps

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Sticky Note

Block 2 - Sticky Note1

Block 3 - Sticky Note2

Block 4 - Sticky Note3

Block 5 - Sticky Note4

Block 6 - Every Day at 8 AM

Block 7 - Check SSL Certificate Expiry

Block 8 - Read Domains from Sheets

Block 9 - Classify Alert Severity

Block 10 - Post Alert to Slack

Block 11 - Filter Expiring Certs

Block 12 - Append Alert Log to Sheets

Block 13 - Create Issue in Linear

Block 14 - Filter High Priority Alerts

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions