# ExtendedLaunchMetric A metric that measures extended launch task durations. ``` struct ExtendedLaunchMetric ``` ## Discussion This metric corresponds to the [`MetricResult.extendedLaunch(_:)`](/documentation/MetricKit/MetricResult/extendedLaunch(_:)) case. It appears only in [`intervalEntries`](/documentation/MetricKit/MetricReport/intervalEntries) and is not included in state entries. The end point of an extended launch is the later of the first rendered frame and the completion of all tasks you track with [`trackLaunchTask(id:onTrackingError:_:)`](/documentation/MetricKit/MetricManager/trackLaunchTask(id:onTrackingError:_:)-48k2s) or [`trackLaunchTask(id:onTrackingError:_:)`](/documentation/MetricKit/MetricManager/trackLaunchTask(id:onTrackingError:_:)-jnu1). ## Topics ### Measurements [`let histogram: Histogram`](/documentation/MetricKit/ExtendedLaunchMetric/histogram) Histogram of extended launch durations. ## Relationships ### Conforms To [`Decodable`](/documentation/Swift/Decodable) [`Sendable`](/documentation/Swift/Sendable) [`Encodable`](/documentation/Swift/Encodable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Hashable`](/documentation/Swift/Hashable) [`Equatable`](/documentation/Swift/Equatable) --- 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)