fix: App start definitions for iOS and Android #15798
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philprime
approved these changes
Dec 12, 2025
| - **UIKit Init**: from pre main initializers to the when starting the Sentry Cocoa SDK. | ||
| - **Application Init**: this reflects the duration of your AppDelegate `application:didFinishLaunchingWithOptions` method or [App conformer's initializer](<https://developer.apple.com/documentation/swiftui/app/main()>) when using SwiftUI, which is from when starting the Cocoa SDK to the [`didFinishLaunchingNotification`][didfinishlaunching]. | ||
| - **Initial Frame Render**: from the [`didFinishLaunchingNotification`][didfinishlaunching] until the app renders its first frame. **Starting with version 9.0.0, this is the default behavior.** In versions prior to 9.0.0, this measured until [`UIWindowDidBecomeVisibleNotification`][uiwindow] unless you enabled the `enablePerformanceV2` option. | ||
| - **Initial Frame Render**: from the [`didFinishLaunchingNotification`][didfinishlaunching] until the first CADisplayLink callback. **Starting with version 9.0.0, this is the default behavior.** In versions prior to 9.0.0, this measured until [`UIWindowDidBecomeVisibleNotification`][uiwindow] unless you enabled the `enablePerformanceV2` option. |
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m: While this is technically more correct, it requires app developers to understand what a CADisplayLink is
markushi
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Dec 12, 2025
| ### `measurements.app_start_cold` | ||
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| A [cold start](/product/insights/mobile/mobile-vitals/app-starts/) refers to when the app launches for the first time after a reboot or update. The app is not in memory and no process exists. | ||
| A [cold start](/product/insights/mobile/mobile-vitals/app-starts/) on Android refers to when the app process is creatd from scratch. On iOS it is only the first time a process is created after a reboot or update. |
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Suggested change
| A [cold start](/product/insights/mobile/mobile-vitals/app-starts/) on Android refers to when the app process is creatd from scratch. On iOS it is only the first time a process is created after a reboot or update. | |
| A [cold start](/product/insights/mobile/mobile-vitals/app-starts/) on Android refers to when the app process is created from scratch. On iOS it is only the first time a process is created after a reboot or update. |
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Corrects the definitions of cold/warm starts
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SLA
Thanks in advance for your help!
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