# AppLaunchDiagnostic A diagnostic report for an app launch. ``` struct AppLaunchDiagnostic ``` ## Discussion This captures a [`CallStackTree`](/documentation/MetricKit/CallStackTree) and a `launchDuration` measurement for app launches that exceed the diagnostic threshold. ## Topics ### Call stack [`let callStackTree: CallStackTree`](/documentation/MetricKit/AppLaunchDiagnostic/callStackTree) The application call stack tree associated with the launch issue. ### Launch details [`let launchDuration: Measurement`](/documentation/MetricKit/AppLaunchDiagnostic/launchDuration) Duration of the launch that triggered this diagnostic. ## Relationships ### Conforms To [`Hashable`](/documentation/Swift/Hashable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Equatable`](/documentation/Swift/Equatable) [`Decodable`](/documentation/Swift/Decodable) [`Sendable`](/documentation/Swift/Sendable) [`Encodable`](/documentation/Swift/Encodable) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)