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feat: cold, warm and hot launch times meter (#66)
<!-- CURSOR_SUMMARY --> > [!NOTE] > Adds automatic measurement of cold/warm app launch times and emits "AppStart" spans with precise start/end timestamps, plus supporting infra and example app tweaks. > > - **Observability (Auto-instrumentation)**: > - Introduces `LaunchMeter` to measure app launch durations (cold/warm) using app lifecycle + first-frame render. > - Adds early uptime capture via `AppStartTime` initialized from ObjC constructor in `ObjCBridge`. > - Extends `Options.AutoInstrumented` with `launchTimes` and wires meter via `options.launchMeter`. > - Emits `"AppStart"` spans with `start.type` attribute and accurate `startTime`/`endTime` when `launchTimes` is enabled. > - **Traces**: > - Adds internal `TracerDecorator.startSpan(name:attributes:startTime:)` to set explicit span start times. > - **Common**: > - Adds lightweight generic `Store` for reducer-based state updates. > - **Package**: > - Adds `ObjCBridge` target and dependencies; pins `ios-client-sdk` to `10.0.0`. > - **Example App**: > - Moves `LDClient.start` to `Client.init()`; removes AppDelegate SDK setup and a manual flush in `TraceView`. > > <sup>Written by [Cursor Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit 4a51e42. This will update automatically on new commits. Configure [here](https://cursor.com/dashboard?tab=bugbot).</sup> <!-- /CURSOR_SUMMARY -->
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‎.swiftpm/xcode/xcshareddata/xcschemes/LaunchDarklyObservability.xcscheme‎

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<?xml version="1.0" encoding="UTF-8"?>
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<Scheme
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LastUpgradeVersion = "2600"
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version = "1.7">
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<BuildAction
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parallelizeBuildables = "YES"
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buildImplicitDependencies = "YES"
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buildArchitectures = "Automatic">
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<BuildActionEntries>
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buildForTesting = "YES"
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buildForRunning = "YES"
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buildForProfiling = "YES"
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buildForArchiving = "YES"
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buildForAnalyzing = "YES">
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<BuildableReference
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "LaunchDarklyObservability"
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BuildableName = "LaunchDarklyObservability"
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BlueprintName = "LaunchDarklyObservability"
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ReferencedContainer = "container:">
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</BuildableReference>
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</BuildActionEntry>
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</BuildActionEntries>
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</BuildAction>
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<TestAction
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buildConfiguration = "Debug"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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shouldUseLaunchSchemeArgsEnv = "YES"
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shouldAutocreateTestPlan = "YES">
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</TestAction>
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<LaunchAction
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buildConfiguration = "Debug"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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launchStyle = "0"
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useCustomWorkingDirectory = "NO"
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ignoresPersistentStateOnLaunch = "NO"
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debugDocumentVersioning = "YES"
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debugServiceExtension = "internal"
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allowLocationSimulation = "YES">
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</LaunchAction>
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<ProfileAction
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buildConfiguration = "Release"
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shouldUseLaunchSchemeArgsEnv = "YES"
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savedToolIdentifier = ""
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useCustomWorkingDirectory = "NO"
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debugDocumentVersioning = "YES">
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<MacroExpansion>
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<BuildableReference
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "LaunchDarklyObservability"
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BuildableName = "LaunchDarklyObservability"
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BlueprintName = "LaunchDarklyObservability"
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ReferencedContainer = "container:">
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</BuildableReference>
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</ProfileAction>
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<AnalyzeAction
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buildConfiguration = "Debug">
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buildConfiguration = "Release"
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revealArchiveInOrganizer = "YES">
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</ArchiveAction>
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</Scheme>

‎.swiftpm/xcode/xcshareddata/xcschemes/LaunchDarklySessionReplay.xcscheme‎

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<?xml version="1.0" encoding="UTF-8"?>
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<Scheme
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LastUpgradeVersion = "2600"
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version = "1.7">
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<BuildAction
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parallelizeBuildables = "YES"
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buildImplicitDependencies = "YES"
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buildArchitectures = "Automatic">
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<BuildActionEntries>
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<BuildActionEntry
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buildForTesting = "YES"
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buildForRunning = "YES"
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buildForProfiling = "YES"
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buildForArchiving = "YES"
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buildForAnalyzing = "YES">
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<BuildableReference
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "LaunchDarklySessionReplay"
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BuildableName = "LaunchDarklySessionReplay"
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BlueprintName = "LaunchDarklySessionReplay"
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ReferencedContainer = "container:">
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</BuildableReference>
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</BuildActionEntries>
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</BuildAction>
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<TestAction
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buildConfiguration = "Debug"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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shouldUseLaunchSchemeArgsEnv = "YES"
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shouldAutocreateTestPlan = "YES">
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</TestAction>
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<LaunchAction
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buildConfiguration = "Debug"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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launchStyle = "0"
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useCustomWorkingDirectory = "NO"
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ignoresPersistentStateOnLaunch = "NO"
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debugDocumentVersioning = "YES"
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debugServiceExtension = "internal"
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allowLocationSimulation = "YES">
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</LaunchAction>
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<ProfileAction
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buildConfiguration = "Release"
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shouldUseLaunchSchemeArgsEnv = "YES"
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savedToolIdentifier = ""
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debugDocumentVersioning = "YES">
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "LaunchDarklySessionReplay"
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BuildableName = "LaunchDarklySessionReplay"
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BlueprintName = "LaunchDarklySessionReplay"
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</Scheme>

‎.swiftpm/xcode/xcshareddata/xcschemes/swift-launchdarkly-observability-Package.xcscheme‎

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<?xml version="1.0" encoding="UTF-8"?>
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<Scheme
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LastUpgradeVersion = "2600"
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version = "1.7">
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<BuildableReference
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BuildableIdentifier = "primary"
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ignoresPersistentStateOnLaunch = "NO"
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debugServiceExtension = "internal"
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<MacroExpansion>
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<BuildableReference
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BuildableName = "LaunchDarklyObservability"
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BlueprintName = "LaunchDarklyObservability"
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ReferencedContainer = "container:">
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</BuildableReference>
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</ProfileAction>
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<AnalyzeAction
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buildConfiguration = "Debug">
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</AnalyzeAction>
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<ArchiveAction
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buildConfiguration = "Release"
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revealArchiveInOrganizer = "YES">
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</ArchiveAction>
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</Scheme>

‎ExampleApp/ExampleApp.xcodeproj/project.pbxproj‎

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ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
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CODE_SIGN_STYLE = Automatic;
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CURRENT_PROJECT_VERSION = 1;
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DEVELOPMENT_TEAM = "";
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ENABLE_PREVIEWS = YES;
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GENERATE_INFOPLIST_FILE = YES;
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INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
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ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
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CODE_SIGN_STYLE = Automatic;
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CURRENT_PROJECT_VERSION = 1;
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DEVELOPMENT_TEAM = "";
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ENABLE_PREVIEWS = YES;
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GENERATE_INFOPLIST_FILE = YES;
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INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;

‎ExampleApp/ExampleApp.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved‎

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‎ExampleApp/ExampleApp/AppDelegate.swift‎

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import UIKit
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import LaunchDarkly
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import LaunchDarklyObservability
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let mobileKey = "mob-48fd3788-eab7-4b72-b607-e41712049dbd"
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let config = { () -> LDConfig in
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var config = LDConfig(
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mobileKey: mobileKey,
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autoEnvAttributes: .enabled
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)
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config.plugins = [
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Observability(
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options: .init(
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otlpEndpoint: "http://localhost:4318",
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sessionBackgroundTimeout: 3,
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isDebug: true,
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logs: .enabled,
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traces: .enabled,
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metrics: .enabled
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)
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)
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]
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/*
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config.plugins = [
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Observability(
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options: .init(
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// otlpEndpoint: "http://localhost:4318",
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sessionBackgroundTimeout: 3,
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isDebug: true,
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disableLogs: false,
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disableTraces: false,
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disableMetrics: false
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)
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)
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]
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*/
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return config
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}()
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let context = { () -> LDContext in
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var contextBuilder = LDContextBuilder(
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key: "12345"
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)
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contextBuilder.kind("user")
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do {
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return try contextBuilder.build().get()
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} catch {
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abort()
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}
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}()
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final class AppDelegate: NSObject, UIApplicationDelegate {
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func application(
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_ application: UIApplication,
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willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil
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) -> Bool {
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return true
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}
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func application(
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_ application: UIApplication,
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didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil
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) -> Bool {
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LDClient.start(
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config: config,
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context: context,
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startWaitSeconds: 5.0,
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completion: { (timedOut: Bool) -> Void in
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if timedOut {
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// Client may not have the most recent flags for the configured context
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} else {
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// Client has received flags for the configured context
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}
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}
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)
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return true
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}
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}

‎ExampleApp/ExampleApp/Client.swift‎

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}
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}()
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func start() {
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init() {
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LDClient.start(
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config: config,
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context: context,

‎ExampleApp/ExampleApp/ExampleAppApp.swift‎

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}
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}
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.environmentObject(browser)
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.onAppear {
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client.start()
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}
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}
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}
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}

‎ExampleApp/ExampleApp/Instrumentation/Manual/TraceView.swift‎

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.task(id: started) {
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guard started else {
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span?.end()
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_ = LDObserve.shared.flush()
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return name = ""
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}
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span = LDObserve.shared.startSpan(name: name, attributes: [:])

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