You built an iOS application and receive crash reports via Crashlytics. You need to capture crash-free user metrics, custom events, and breadcrumbs. Which action should you take?

To capture crash-free user metrics, custom events, and breadcrumbs with Crashlytics, you need to import the Firebase module into your UIApplicationDelegate. Crashlytics is part of Firebase, and importing the module allows you to initialize and use its advanced features for comprehensive crash reporting and analytics within your iOS application. Configuring the xcworkspace file is a general project setup step and doesn't directly enable these specific Crashlytics features. Adding the Google Analytics pod would integrate Google Analytics, which is a separate analytics service from Crashlytics, and wouldn't provide the requested Crashlytics-specific data. While configuring the Crashlytics pod is necessary for basic integration, importing the Firebase module in UIApplicationDelegate is the specific action that enables the full suite of Crashlytics features, including crash-free user metrics, custom events, and breadcrumbs, by initializing the Firebase SDK.