Linear Integration

Trunk allows you to automate Linear Issue creation through webhooks. This will allow you to create Linear issues and auto-assign according to CODEOWNERS.

This guide will walk you through integrating Trunk Flaky Tests with Linear Issues through webhooks. You will be able to automatically generate Linear issues for new flaky tests found in your repo that impact more than 2 PRs. This guide should take 15 minutes to complete.

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1. Create a Linear Personal Access Token

Before you can create a webhook to automate GitHub Issue creation, you need to create an API token to authorize your requests.

1. In the Linear app, navigate to settings by holding G and pressing S, or by clicking on your profile on the top left and clicking Settings.

2. Under Account > Security & Access > Personal API Keys, Click New API Key to create a new access token.

3. Copy the new API key and save it in a secure location; you'll need to use this later.

2. Add a New Webhook In Trunk

Trunk uses Svix to integrate with other services, such as creating Linear Issues through webhooks.

You can create a new endpoint by:

1. Login to Trunk Flaky Tests

2. From your profile on the top right, navigate to Settings

3. Under Organization > Webhooks, click Add Endpoint

4. Paste the Linear GraphQL API endpoint into Endpoint URL, which is: https://api.linear.app/graphql.

5. Under Subscribe to events, select test_case.status_changed

6. Create the new endpoint. You will be redirected to the endpoint configuration view.

If you're having trouble adding a new webhook endpoint with Svix, please see the Adding Endpoint docs from Svix.

3. Add Custom Headers

The Linear GraphQL API requires some custom headers. You can configure custom headers in Trunk:

1. You can add custom headers under Advanced > Custom Headers

2. Fill in the Key and Value referencing the table below, and click the + button to add each header.

You'll need to configure the following headers.

Key	Value
Authorization	<YOUR_API_TOKEN>

4. Find Your Linear Team, Project, and Label IDs

You need to find your Linear team, project, and label IDs to create issues with the appropriate labeling. You can do this by querying your Linear project using cURL.

Team ID

First, you'll need to find your team ID so you can create Linear issues under the correct team. You can make a request in your terminal using cURL, or a similar tool.

You'll need your Linear API key from step 1.

curl \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: <LINEAR_API_KEY>" \
  --data '{
    "query": "query Teams { teams { nodes { id name } }}"
  }' \
  https://api.linear.app/graphql

You will receive a response that contains your team UID, for example:

{
  "data": {
    "teams": {
      "nodes": [
        {
          "id": "9bd0672b-7766-4a7c-3233-8ce37fdbb790",
          "name": "Your Linear Team"
        }
      ]
    }
  }
}

Project ID

If you want to create issues under a specific project, you'll need to find its project ID. You can use a query like this:

curl \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: lin_api_vw3gMdb2NJN9TQ66JCgBKLqNSNY6I8cH5qxwM6EW" \
  --data '{
    "query": "query Projects { projects { nodes { id name } }}"
  }' \
  https://api.linear.app/graphql

You'll receive a response that contains your projects and their IDs, for example:

{
  "data": {
    "projects": {
      "nodes": [
        {
          "id": "ef19b35e-ce4f-4132-9705-811d4d6c8c08",
          "name": "Flaky Tests"
        }
      ]
    }
  }
}

Label ID

If you want to create issues with a specific label, you'll need to find its label ID. You can use a query like this:

curl \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: lin_api_vw3gMdb2NJN9TQ66JCgBKLqNSNY6I8cH5qxwM6EW" \
  --data '{
    "query": "query OrgLabels { organization { labels { nodes { id name } } }}"
  }' \
  https://api.linear.app/graphql

You'll receive a response that contains your labels and their IDs, for example:

{
  "data": {
    "organization": {
      "labels": {
        "nodes": [
          {
            "id": "e0e9f98e-c90c-40cd-939e-06ff7bd57b45",
            "name": "Feature"
          },
          {
            "id": "ce07d3bd-dee8-4bf6-979e-778dd94f15af",
            "name": "Bug"
          },
          {
            "id": "536dd774-dc33-4e70-aecc-8b00d1f04a9d",
            "name": "Improvement"
          },
          ...
        ]
      }
    }
  }
}

5. Add a Custom Transformation

Next, you must create a custom transformation to turn the Trunk Flaky Tests event into a Linear Issue.

1. In the endpoint configuration view, navigate to the Advanced tab. Under Transformation, toggle the Enabled switch.

2. Click Edit transformation to create a custom transformation script.

3. Copy and paste the transformation script below and click Save. You can modify this script to customize how your issues look and what they contain.

4. You can test the transformation by selecting the test_case.status_changed payload and clicking Run Test. This will test the transformation but not send a message. You will learn to send a test message in step 5.

An example transformation script is provided below and you can customize your Linear Issues integration by following the Linear API and Svix transformations documentation.

/**
 * @param webhook the webhook object
 * @param webhook.method destination method. Allowed values: "POST", "PUT"
 * @param webhook.url current destination address
 * @param webhook.eventType current webhook Event Type
 * @param webhook.payload JSON payload
 * @param webhook.cancel whether to cancel dispatch of the given webhook
 */
function handler(webhook) {
  const impacted_prs = webhook.payload.test_case.pull_requests_impacted_last_7d;
  const newStatus = webhook.payload.status_change.current_status.value;

  // Filter for only flaky tests that impact more than 2 PRs
  if (newStatus !== "flaky" || impacted_prs < 2) {
    webhook.payload = "canceled";
    webhook.cancel = true;
    return webhook;
  }

  const description = summarizeTestCase(webhook.payload);

  // modify the webhook object...
  webhook.payload = {query: `mutation IssueCreate {
    issueCreate(
      input: {
        title: "Flaky Test: ${webhook.payload.test_case.name}"
        description: """${description}"""
        teamId: "<YOUR_TEAM_ID>"
        projectId: "<YOUR_PROJECT_ID>"
        labelIds: ["<YOUR_LABEL_ID>"]
      }
    ) {
      success
      issue {
        id
        title
      }
    }
  } ` };
  return webhook;
}

function summarizeTestCase(payload) {
    const {
        status_change: {
            previous_status
        },
        test_case: {
            name,
            file_path,
            status,
            quarantine,
            repository,
            codeowners,
            failure_rate_last_7d,
            most_common_failures,
            pull_requests_impacted_last_7d,
            ticket,
            html_url
        }
    } = payload;
    // Construct a comprehensive issue body with key details
    const issueBody = `See all details on the [Trunk Test Detail page](${html_url})
 
Transition time: ${status.timestamp}
 
Latest failure: Dec 9, 2024
 
Severity (last 7 days): ${(failure_rate_last_7d * 100).toFixed(2)}% failure rate; impacting ${pull_requests_impacted_last_7d} PRs
 
Ownership: this test is owned by ${(codeowners || ['@unassigned']).join(', ')}

___
__The  most common failure reason (out of ${most_common_failures.length} identified failure reason) are:__

${
  most_common_failures.map((failure, index) => {
    return `**Reason #${index + 1}**: "${failure.summary}" \n`
  })
}

View the full stack trace on the [Test Detail page](${html_url})
    `
    return issueBody
}

(Optional) Automatic Issue Assignment

If you have CODEOWNERS configured in your repo, it will be reported by Trunk in the webhook payload. You can use this to map different CODEOWNERS to Linear assignees. You can access CODEOWNERS in the payload like this: webhook.payload.test_case.codeowners.

Since the way your owners map to your Linear user is unique to your team, you'll need to provide your own mapping to convert code owners to their Linear ID.

You can modify your issue create payload like this to include an assignee:

webhook.payload = {query: `mutation IssueCreate {
    issueCreate(
      input: {
        title: "Flaky Test: ${webhook.payload.test_case.name}"
        description: """${description}"""
        teamId: "<YOUR_TEAM_ID>"
        projectId: "<YOUR_PROJECT_ID>"
        labelIds: ["<YOUR_LABEL_ID>"]
        // Add you assignee here:
        assigneeId: "<ASSIGNEE_ID>"
      }
    ) {
      success
      issue {
        id
        title
      }
    }
  } ` };

6. Test Your Webhook

You can create test issues by delivering a mock webhook. You can do this by:

1. In the endpoint configuration view, navigate to the Testing tab and select a Send event

2. Under Subscribed events, select test_case.status_changedas the event type to send

3. Click Send Example to test your webhook

7. Monitoring Webhooks

You can monitor the events and the webhook's delivery logs in the Overview tab of an endpoint configuration view.

You can see an overview of how many webhook deliveries have been attempted, how many are successful, how many are in-flight, and how many fail in the Attempt Delivery Stats modal.

You can see a list of past delivery attempts in the Message Attempts modal. You can filter this list by Succeeded and Failed status, and you can click on each message to see the Message content, response code, and error message of each attempt. You can learn more about replaying messages and filtering logs in the Svix docs.

Congratulations!

A Linear Issue will now be created when a test's health status changes to flaky and impacts more than 2 PRs. You can further modify your transformation script to customize your issues.

See the Trunk webhook event catalog

Learn more about consuming webhooks in the Svix docs

Learn more about Linear's API