Sentry

Overview

This topic explains how to use the LaunchDarkly Sentry integration. Sentry is an application performance monitoring and error tracking tool. You can connect Sentry error events to LaunchDarkly to use with LaunchDarkly metrics.

The Sentry integration works with custom conversion binary and custom conversion count metrics. To learn more, read Metrics.

To use the Sentry integration, you must complete the following steps:

1. Install Sentry
2. Configure the integration
3. Create a LaunchDarkly metric
4. Attach LaunchDarkly contexts to Sentry error events

Install Sentry

To install the Sentry integration:

1. Log in to LaunchDarkly.
2. Navigate to the public integrations directory in Sentry's application.
3. Click Install.

You are redirected to the Sentry integration panel in LaunchDarkly.

Configure the integration

There are two pieces of configuration required for the Sentry integration to work:

• setting the event key, and
• mapping the environments.

Set the event key

Sentry uses the event key to aggregate events. We recommend using a Metric event key of sentry-errors or similar, but you can use any event key you like.

A LaunchDarkly metric must exist with the designated event key for the integration to work in a given project. If there is not an existing custom metric with the chosen event key, create a custom metric with that event key. To learn how, read Create a LaunchDarkly metric.

When you set a metric event key, a green check mark appears in the integration panel.

Map environments

Events are specific to one LaunchDarkly environment. The Sentry integration requires you to map Sentry environments to LaunchDarkly environments. This lets you send Sentry errors to different LaunchDarkly environments. For example, you can send errors from your production Sentry environment to your production LaunchDarkly environment, and errors from your staging Sentry environment to your staging LaunchDarkly environment.

To map Sentry environments to LaunchDarkly environments:

1. Navigate to the Integrations page in LaunchDarkly.
2. Open the Sentry integration panel.
3. In the "Environment mappings" section, choose a LaunchDarkly project and environment from the Project - Environment menu.
4. Choose a Sentry project and environment from the Sentry Project - Environment menu.
5. Click Create.

The sets of projects and environments are now mapped to each other.

If an environment mapping is highlighted in red, it means that there is no metric for the event key in that LaunchDarkly project.

You can map any number of Sentry project environments to a LaunchDarkly environment. However, you cannot map multiple LaunchDarkly environments to a single Sentry environment.

Create a LaunchDarkly metric

To create a LaunchDarkly metric, follow the procedure at Custom conversion binary metrics or Custom conversion count metrics, depending on your needs.

Here are two example metrics we recommend.

Percentage of end users that experienced an error

To track the percentage of end users that experienced an error, create a custom conversion binary metric by selecting the following options:

• Event kind: Custom
• Event key: sentry-errors
• What do you want to measure?: Occurrence

With the metric definition options:

• Percentage of User units that sent the event,
• where Lower is better

Here is what the metric setup looks like:

Average number of errors per request

To track the average number of errors per request, create a custom conversion count metric by selecting the following options:

• Event kind: Custom
• Event key: sentry-errors
• What do you want to measure?: Count

With the metric definition options:

• Average of event count
• per Request,
• where Lower is better

Here is what the metric setup looks like:

After you create your metrics, return to the Sentry integration configuration panel and set the Sentry integration event key if you have not already done so.

Attach LaunchDarkly contexts to Sentry error events

Sentry provides custom contexts which let you attach arbitrary data to a Sentry event. To use the Sentry integration, you must name the Sentry custom context launchdarklyContext and then attach LaunchDarkly contexts to error events. To learn how, read Sentry's Context docs.

Using the integration

After you create the environment mappings, set the metric event key, create metrics for your desired projects, and add LaunchDarkly contexts to the Sentry SDK, you can use the metric in LaunchDarkly the same way as any other metric. When you configure a metric to use Sentry errors, error events will flow from Sentry into that metric.