4. Monitoring & Alerting

Set up alerts for failed executions.

15m Lesson 4 of 5

Don't wait for users to report broken automations. Proactive monitoring ensures you catch and fix issues before they impact your business.

Monitoring Layers

Workflow-level: Error Trigger workflow catches all failures
Instance-level: Health check endpoint monitoring
Infrastructure-level: Docker/server resource monitoring
Business-level: Track expected outcomes (e.g., "did the daily report send?")

Error Trigger Workflow

Create a special workflow with the "Error Trigger" node. It fires whenever ANY other workflow fails, giving you centralized error handling.

Code Examples

Slack Alert for Failed Workflows

javascript

// In your Error Trigger workflow:
const error = $input.first().json;

const slackMessage = {
  blocks: [
    {
      type: "header",
      text: { type: "plain_text", text: "🚨 Workflow Failed" }
    },
    {
      type: "section",
      fields: [
        { type: "mrkdwn", text: `*Workflow:*\n${error.workflow.name}` },
        { type: "mrkdwn", text: `*Node:*\n${error.execution.lastNodeExecuted}` },
        { type: "mrkdwn", text: `*Error:*\n${error.execution.error.message}` },
        { type: "mrkdwn", text: `*Time:*\n${new Date().toISOString()}` }
      ]
    },
    {
      type: "actions",
      elements: [{
        type: "button",
        text: { type: "plain_text", text: "View Execution" },
        url: `${$env.N8N_HOST}/execution/${error.execution.id}`
      }]
    }
  ]
};

return [{ json: slackMessage }];

Pro Tips

💡Create a dedicated "Error Handler" workflow that all production workflows report to
💡Include the workflow name, error message, and execution URL in alert messages
💡Set up a daily "heartbeat" check — if your critical workflows haven't run, something is wrong

Comprehension Quiz

Answer 2 of 2 correctly to unlock lesson completion.

1. What does an Error Trigger workflow do?

2. What is a "heartbeat" check?

Pass the quiz above to unlock lesson completion

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All lessons in this chapter

1. Reading Execution Logs15m 2. Common Errors & Fixes15m 3. Advanced Error Handling15m 4. Monitoring & Alerting15m 5. Performance Optimization15m