From 81d68e537449d5ac74656e15550e78881d649fbd Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Wed, 28 Aug 2024 15:41:34 -0400
Subject: [PATCH 01/15] add app launch tti log

---
 platform/swift/source/CaptureRustBridge.h  | 12 ++++++++++++
 platform/swift/source/CoreLogger.swift     |  4 ++++
 platform/swift/source/LoggerBridge.swift   |  4 ++++
 platform/swift/source/LoggerBridging.swift |  2 ++
 platform/swift/source/Logging.swift        |  2 ++
 platform/swift/source/src/bridge.rs        | 14 ++++++++++++++
 6 files changed, 38 insertions(+)

diff --git a/platform/swift/source/CaptureRustBridge.h b/platform/swift/source/CaptureRustBridge.h
index 019ca8557..7620c31e7 100644
--- a/platform/swift/source/CaptureRustBridge.h
+++ b/platform/swift/source/CaptureRustBridge.h
@@ -147,6 +147,18 @@ void capture_write_app_update_log(
     double duration_ms
 );
 
+/*
+ * Writes an app launch TTI log.
+ *
+ * @param loggerId the ID of the logger to write to.
+ * @param duration_ms the duration of time between a user's intent to launch it and the point in time 
+ *        when the app became interactive.
+ */
+void capture_write_app_launch_tti_log(
+    logger_id logger_id,
+    double duration_ms
+);
+
 /*
  * Starts new sessions using configured session strategy.
  *
diff --git a/platform/swift/source/CoreLogger.swift b/platform/swift/source/CoreLogger.swift
index b1ffbcaab..f6082e7f3 100644
--- a/platform/swift/source/CoreLogger.swift
+++ b/platform/swift/source/CoreLogger.swift
@@ -120,6 +120,10 @@ extension CoreLogger: CoreLogging {
         )
     }
 
+    func logAppLaunchTTI(duration: TimeInterval) {
+        self.underlyingLogger.logAppLaunchTTI(duration: duration)
+    }
+
     func startNewSession() {
         self.underlyingLogger.startNewSession()
     }
diff --git a/platform/swift/source/LoggerBridge.swift b/platform/swift/source/LoggerBridge.swift
index 3851f8be9..17ce03517 100644
--- a/platform/swift/source/LoggerBridge.swift
+++ b/platform/swift/source/LoggerBridge.swift
@@ -127,6 +127,10 @@ final class LoggerBridge: LoggerBridging {
         capture_write_app_update_log(self.loggerID, appVersion, buildNumber, appSizeBytes, duration)
     }
 
+    func logAppLaunchTTI(duration: TimeInterval) {
+        capture_write_app_launch_tti_log(self.loggerID, duration)
+    }
+
     func startNewSession() {
         capture_start_new_session(self.loggerID)
     }
diff --git a/platform/swift/source/LoggerBridging.swift b/platform/swift/source/LoggerBridging.swift
index 1eea7ca3b..d5746ad5f 100644
--- a/platform/swift/source/LoggerBridging.swift
+++ b/platform/swift/source/LoggerBridging.swift
@@ -41,6 +41,8 @@ protocol LoggerBridging {
         duration: TimeInterval
     )
 
+    func logAppLaunchTTI(duration: TimeInterval)
+
     func start()
 
     func startNewSession()
diff --git a/platform/swift/source/Logging.swift b/platform/swift/source/Logging.swift
index be26bf510..927d3203e 100644
--- a/platform/swift/source/Logging.swift
+++ b/platform/swift/source/Logging.swift
@@ -112,6 +112,8 @@ public protocol Logging {
     func startSpan(
         name: String, level: LogLevel, file: String?, line: Int?, function: String?, fields: Fields?
     ) -> Span
+
+    func logAppLaunchTTI(duration: TimeInterval)
 }
 
 extension Logging {
diff --git a/platform/swift/source/src/bridge.rs b/platform/swift/source/src/bridge.rs
index 9fc159de8..ab1a06bf1 100644
--- a/platform/swift/source/src/bridge.rs
+++ b/platform/swift/source/src/bridge.rs
@@ -738,6 +738,20 @@ extern "C" fn capture_write_app_update_log(
   );
 }
 
+#[no_mangle]
+extern "C" fn capture_write_app_launch_tti_log(
+  logger_id: LoggerId<'_>,
+  duration_s: f64,
+) {
+  with_handle_unexpected(
+    || -> anyhow::Result<()> {
+      logger_id.log_app_launch_tti(Duration::seconds_f64(duration_s));
+      Ok(())
+    },
+    "swift write app launch TTI log",
+  );
+}
+
 #[no_mangle]
 extern "C" fn capture_start_new_session(logger_id: LoggerId<'_>) {
   logger_id.start_new_session();

From 4f2d648a3b4e474b8fa82266a42b79e19848d9be Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Wed, 28 Aug 2024 16:33:02 -0400
Subject: [PATCH 02/15] implement app launch TTI event on iOS

---
 .../swift/hello_world/LoggerCustomer.swift    |  4 ++++
 platform/shared/src/lib.rs                    | 22 +++++++++++++++++++
 platform/swift/source/Capture.swift           | 11 ++++++++++
 platform/swift/source/CaptureRustBridge.h     |  2 +-
 platform/swift/source/CoreLogging.swift       |  7 ++++++
 platform/swift/source/Logger.swift            |  4 ++++
 platform/swift/source/src/bridge.rs           |  5 +----
 7 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/examples/swift/hello_world/LoggerCustomer.swift b/examples/swift/hello_world/LoggerCustomer.swift
index d2322f84a..983a6e2e2 100644
--- a/examples/swift/hello_world/LoggerCustomer.swift
+++ b/examples/swift/hello_world/LoggerCustomer.swift
@@ -79,6 +79,8 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
     }
 
     override init() {
+        let start = Date()
+
         Logger
             .configure(
                 withAPIKey: kBitdriftAPIKey,
@@ -95,6 +97,8 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
         super.init()
 
         MXMetricManager.shared.add(self)
+
+        Logger.logAppLaunchTTI(duration: Date().timeIntervalSince(start))
     }
 
     func startNewSession() {
diff --git a/platform/shared/src/lib.rs b/platform/shared/src/lib.rs
index 2d67eb18b..a0448a396 100644
--- a/platform/shared/src/lib.rs
+++ b/platform/shared/src/lib.rs
@@ -9,6 +9,7 @@ pub mod error;
 pub mod metadata;
 
 use bd_client_common::error::handle_unexpected;
+use bd_logger::{log_level, AnnotatedLogField, LogField, LogFieldKind, LogType};
 use bd_runtime::runtime::Snapshot;
 use std::future::Future;
 use std::ops::Deref;
@@ -158,6 +159,27 @@ impl LoggerHolder {
     holder.shutdown(false);
     drop(holder);
   }
+
+  /// Logs an out-of-the-box app launch TTI log event.
+  pub fn log_app_launch_tti(&self, duration: time::Duration) {
+    let fields = vec![AnnotatedLogField {
+      field: LogField {
+        key: "_duration_ms".into(),
+        value: (duration.as_seconds_f64() * 1_000f64).to_string().into(),
+      },
+      kind: LogFieldKind::Ootb,
+    }];
+
+    self.log(
+      log_level::INFO,
+      LogType::Lifecycle,
+      "AppLaunchTTI".into(),
+      fields,
+      vec![],
+      None,
+      false,
+    );
+  }
 }
 
 impl<'a> From<LoggerId<'a>> for i64 {
diff --git a/platform/swift/source/Capture.swift b/platform/swift/source/Capture.swift
index ad0b4b37f..6b9518bd6 100644
--- a/platform/swift/source/Capture.swift
+++ b/platform/swift/source/Capture.swift
@@ -261,6 +261,17 @@ extension Logger {
         )
     }
 
+    // MARK: - Predefined Logs
+
+    /// Writes an app launch TTI log event. This event should be logged only once per Logger configuration.
+    /// Consecutive calls have no effect.
+    ///
+    /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
+    ///                       interactive.
+    public static func logAppLaunchTTI(duration: TimeInterval) {
+        Self.getShared()?.logAppLaunchTTI(duration: duration)
+    }
+
     // MARK: - Network Activity Logging
 
     /// Logs information about a network request.
diff --git a/platform/swift/source/CaptureRustBridge.h b/platform/swift/source/CaptureRustBridge.h
index 7620c31e7..edf2a2878 100644
--- a/platform/swift/source/CaptureRustBridge.h
+++ b/platform/swift/source/CaptureRustBridge.h
@@ -151,7 +151,7 @@ void capture_write_app_update_log(
  * Writes an app launch TTI log.
  *
  * @param loggerId the ID of the logger to write to.
- * @param duration_ms the duration of time between a user's intent to launch it and the point in time 
+ * @param duration_ms the duration of time between a user's intent to launch an app and the point in time 
  *        when the app became interactive.
  */
 void capture_write_app_launch_tti_log(
diff --git a/platform/swift/source/CoreLogging.swift b/platform/swift/source/CoreLogging.swift
index 643dd107f..35bd15bc0 100644
--- a/platform/swift/source/CoreLogging.swift
+++ b/platform/swift/source/CoreLogging.swift
@@ -89,6 +89,13 @@ protocol CoreLogging: AnyObject {
         duration: TimeInterval
     )
 
+    /// Writes an app launch TTI log event. This event should be logged only once per Logger configuration.
+    /// Consecutive calls have no effect.
+    ///
+    /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
+    ///                       interactive.
+    func logAppLaunchTTI(duration: TimeInterval)
+
     /// Stars new session using configured session strategy.
     func startNewSession()
 
diff --git a/platform/swift/source/Logger.swift b/platform/swift/source/Logger.swift
index 703a7344b..b4406d1d2 100644
--- a/platform/swift/source/Logger.swift
+++ b/platform/swift/source/Logger.swift
@@ -462,6 +462,10 @@ extension Logger: Logging {
             timeProvider: self.timeProvider
         )
     }
+
+    public func logAppLaunchTTI(duration: TimeInterval) {
+        self.underlyingLogger.logAppLaunchTTI(duration: duration)
+    }
 }
 
 // MARK: - Features
diff --git a/platform/swift/source/src/bridge.rs b/platform/swift/source/src/bridge.rs
index af9771e39..0de572675 100644
--- a/platform/swift/source/src/bridge.rs
+++ b/platform/swift/source/src/bridge.rs
@@ -739,10 +739,7 @@ extern "C" fn capture_write_app_update_log(
 }
 
 #[no_mangle]
-extern "C" fn capture_write_app_launch_tti_log(
-  logger_id: LoggerId<'_>,
-  duration_s: f64,
-) {
+extern "C" fn capture_write_app_launch_tti_log(logger_id: LoggerId<'_>, duration_s: f64) {
   with_handle_unexpected(
     || -> anyhow::Result<()> {
       logger_id.log_app_launch_tti(Duration::seconds_f64(duration_s));

From 150da31cb6f43cab9ed243a3d90aa063cfc503e0 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Wed, 28 Aug 2024 17:04:58 -0400
Subject: [PATCH 03/15] add android implementation

---
 examples/android/MainActivity.kt              |  5 +++
 examples/swift/hello_world/ContentView.swift  |  3 +-
 .../swift/hello_world/LoggerCustomer.swift    | 10 +++--
 .../kotlin/io/bitdrift/capture/Capture.kt     | 14 +++++++
 .../io/bitdrift/capture/CaptureJniLibrary.kt  | 12 ++++++
 .../kotlin/io/bitdrift/capture/ILogger.kt     | 13 +++++++
 .../kotlin/io/bitdrift/capture/LoggerImpl.kt  |  4 ++
 platform/jvm/src/jni.rs                       | 19 +++++++++
 platform/shared/src/lib.rs                    | 39 +++++++++++--------
 platform/swift/source/Logger.swift            |  8 ++--
 platform/swift/source/Logging.swift           | 13 ++++++-
 11 files changed, 113 insertions(+), 27 deletions(-)

diff --git a/examples/android/MainActivity.kt b/examples/android/MainActivity.kt
index 2e405376b..1d25d77ab 100644
--- a/examples/android/MainActivity.kt
+++ b/examples/android/MainActivity.kt
@@ -48,6 +48,9 @@ import okhttp3.Request
 import okhttp3.Response
 import java.io.IOException
 import kotlin.system.exitProcess
+import kotlin.time.Duration
+import kotlin.time.DurationUnit
+import kotlin.time.toDuration
 
 class MainActivity : ComponentActivity() {
 
@@ -121,6 +124,8 @@ class MainActivity : ComponentActivity() {
 
         Logger.addField("field_container_field_key", "field_container_field_value")
         Logger.logInfo(mapOf("key" to "value")) { "MainActivity onCreate called" }
+
+        Logger.logAppLaunchTTI(1.toDuration(DurationUnit.SECONDS))
     }
 
     private fun createComposeUI() {
diff --git a/examples/swift/hello_world/ContentView.swift b/examples/swift/hello_world/ContentView.swift
index ff63e1409..edd52ef3f 100644
--- a/examples/swift/hello_world/ContentView.swift
+++ b/examples/swift/hello_world/ContentView.swift
@@ -17,8 +17,8 @@ struct ContentView: View {
     @State private var selectedLogLevel = LoggerCustomer.LogLevel.info
 
     init(navigationController: UINavigationController?) {
-        self.navigationController = navigationController
         self.loggerCustomer = LoggerCustomer()
+        self.navigationController = navigationController
         self.currentSessionID = self.loggerCustomer.sessionID ?? "No Session ID"
     }
 
@@ -103,6 +103,7 @@ struct ContentView: View {
             }
         }
         .padding(5)
+        .onAppear { self.loggerCustomer.logAppLaunchTTI() }
     }
 }
 
diff --git a/examples/swift/hello_world/LoggerCustomer.swift b/examples/swift/hello_world/LoggerCustomer.swift
index 983a6e2e2..396c46564 100644
--- a/examples/swift/hello_world/LoggerCustomer.swift
+++ b/examples/swift/hello_world/LoggerCustomer.swift
@@ -44,6 +44,8 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
         var id: String { return self.rawValue }
     }
 
+    private var appStartTime: Date
+
     private let requestDefinitions = [
         // swiftlint:disable:next force_unwrapping use_static_string_url_init
         RequestDefinition(method: "GET", url: URL(string: "https://httpbin.org/get")!),
@@ -79,7 +81,7 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
     }
 
     override init() {
-        let start = Date()
+        self.appStartTime = Date()
 
         Logger
             .configure(
@@ -97,8 +99,6 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
         super.init()
 
         MXMetricManager.shared.add(self)
-
-        Logger.logAppLaunchTTI(duration: Date().timeIntervalSince(start))
     }
 
     func startNewSession() {
@@ -164,6 +164,10 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
             Logger.logTrace("Sending log with level [Trace]", fields: fields)
         }
     }
+
+    func logAppLaunchTTI() {
+        Logger.logAppLaunchTTI(duration: Date().timeIntervalSince(self.appStartTime))
+    }
 }
 
 extension LoggerCustomer: MXMetricManagerSubscriber {
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
index 6db5116e9..6a314b9c8 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
@@ -20,6 +20,7 @@ import io.bitdrift.capture.providers.SystemDateProvider
 import io.bitdrift.capture.providers.session.SessionStrategy
 import okhttp3.HttpUrl
 import java.util.concurrent.atomic.AtomicReference
+import kotlin.time.Duration
 
 /**
  * Top level namespace Capture SDK.
@@ -278,6 +279,19 @@ object Capture {
             logger()?.log(level = level, fields = fields, throwable = throwable, message = message)
         }
 
+        /**
+         * Writes an app launch TTI log event. This event should be logged only once per Logger configuration.
+         * Consecutive calls have no effect.
+         *
+         * @param duration The time between a user's intent to launch the app and when the app becomes
+         *                 interactive.
+         */
+        @JvmStatic
+        @JvmOverloads
+        fun logAppLaunchTTI(duration: Duration) {
+            logger()?.logAppLaunchTTI(duration)
+        }
+
         /**
          * Signals that an operation has started at this point in time.
          *
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
index 912c0e160..6010ec587 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
@@ -229,6 +229,18 @@ internal object CaptureJniLibrary {
         durationS: Double,
     )
 
+    /**
+     * Writes an app launch TTI log.
+     *
+     * @param loggerId the ID of the logger to write to.
+     * @param durationS the time between a user's intent to launch the app and when the app becomes
+     *                  interactive.
+     */
+    external fun writeAppLaunchTTILog(
+        loggerId: Long,
+        durationS: Double,
+    )
+
     /**
      * Flushes logger's state to disk.
      *
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt
index 01d81cff4..299ab3c1c 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt
@@ -10,6 +10,7 @@ package io.bitdrift.capture
 import io.bitdrift.capture.events.span.Span
 import io.bitdrift.capture.network.HttpRequestInfo
 import io.bitdrift.capture.network.HttpResponseInfo
+import kotlin.time.Duration
 
 /**
  * A Capture SDK logger interface.
@@ -72,6 +73,7 @@ interface ILogger {
 
     /**
      * Logs a message at a specified level.
+     *
      * @param level the severity of the log.
      * @param fields and optional collection of key-value pairs to be added to the log line.
      * @param throwable an optional throwable to include in the log line.
@@ -84,6 +86,15 @@ interface ILogger {
         message: () -> String,
     )
 
+    /**
+     * Writes an app launch TTI log event. This event should be logged only once per Logger configuration.
+     * Consecutive calls have no effect.
+     *
+     * @param duration The time between a user's intent to launch the app and when the app becomes
+     *                 interactive.
+     */
+    fun logAppLaunchTTI(duration: Duration)
+
     /**
      * Signals that an operation has started at this point in time. Each operation consists of start
      * and end event logs. The start event is emitted immediately upon calling the
@@ -100,12 +111,14 @@ interface ILogger {
 
     /**
      * Records information about an HTTP network request
+     *
      * @param httpRequestInfo information used to enrich the log line
      */
     fun log(httpRequestInfo: HttpRequestInfo)
 
     /**
      * Records information about an HTTP network response
+     *
      * @param httpResponseInfo information used to enrich the log line
      */
     fun log(httpResponseInfo: HttpResponseInfo)
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/LoggerImpl.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/LoggerImpl.kt
index fc2dbd4eb..6c34120b6 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/LoggerImpl.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/LoggerImpl.kt
@@ -284,6 +284,10 @@ internal class LoggerImpl(
         )
     }
 
+    override fun logAppLaunchTTI(duration: Duration) {
+        CaptureJniLibrary.writeAppLaunchTTILog(this.loggerId, duration.toDouble(DurationUnit.SECONDS))
+    }
+
     override fun startSpan(name: String, level: LogLevel, fields: Map<String, String>?): Span {
         return Span(this, name, level, fields)
     }
diff --git a/platform/jvm/src/jni.rs b/platform/jvm/src/jni.rs
index 1b2032dd9..b8c0e18ec 100644
--- a/platform/jvm/src/jni.rs
+++ b/platform/jvm/src/jni.rs
@@ -995,6 +995,25 @@ pub extern "system" fn Java_io_bitdrift_capture_CaptureJniLibrary_writeAppUpdate
   );
 }
 
+#[no_mangle]
+pub extern "system" fn Java_io_bitdrift_capture_CaptureJniLibrary_writeAppLaunchTTILog(
+  _env: JNIEnv<'_>,
+  _class: JClass<'_>,
+  logger_id: jlong,
+  duration_s: f64,
+) {
+  bd_client_common::error::with_handle_unexpected(
+    || -> anyhow::Result<()> {
+      let logger = unsafe { LoggerId::from_raw(logger_id) };
+      logger.log_app_launch_tti(Duration::seconds_f64(duration_s));
+
+      Ok(())
+    },
+    "jni write app launch TTI log",
+  );
+}
+
+
 #[no_mangle]
 pub extern "system" fn Java_io_bitdrift_capture_CaptureJniLibrary_flush(
   _env: JNIEnv<'_>,
diff --git a/platform/shared/src/lib.rs b/platform/shared/src/lib.rs
index a0448a396..f86c00ca6 100644
--- a/platform/shared/src/lib.rs
+++ b/platform/shared/src/lib.rs
@@ -11,6 +11,7 @@ pub mod metadata;
 use bd_client_common::error::handle_unexpected;
 use bd_logger::{log_level, AnnotatedLogField, LogField, LogFieldKind, LogType};
 use bd_runtime::runtime::Snapshot;
+use parking_lot::Once;
 use std::future::Future;
 use std::ops::Deref;
 use std::pin::Pin;
@@ -93,6 +94,7 @@ pub struct LoggerHolder {
   logger: bd_logger::Logger,
   handle: bd_logger::LoggerHandle,
   future: parking_lot::Mutex<Option<LoggerFuture>>,
+  app_launch_tti_log: Once,
 }
 
 impl Deref for LoggerHolder {
@@ -110,6 +112,7 @@ impl LoggerHolder {
       logger,
       handle,
       future: parking_lot::Mutex::new(Some(future)),
+      app_launch_tti_log: Once::new(),
     }
   }
 
@@ -162,23 +165,25 @@ impl LoggerHolder {
 
   /// Logs an out-of-the-box app launch TTI log event.
   pub fn log_app_launch_tti(&self, duration: time::Duration) {
-    let fields = vec![AnnotatedLogField {
-      field: LogField {
-        key: "_duration_ms".into(),
-        value: (duration.as_seconds_f64() * 1_000f64).to_string().into(),
-      },
-      kind: LogFieldKind::Ootb,
-    }];
-
-    self.log(
-      log_level::INFO,
-      LogType::Lifecycle,
-      "AppLaunchTTI".into(),
-      fields,
-      vec![],
-      None,
-      false,
-    );
+    self.app_launch_tti_log.call_once(|| {
+      let fields = vec![AnnotatedLogField {
+        field: LogField {
+          key: "_duration_ms".into(),
+          value: (duration.as_seconds_f64() * 1_000f64).to_string().into(),
+        },
+        kind: LogFieldKind::Ootb,
+      }];
+  
+      self.log(
+        log_level::INFO,
+        LogType::Lifecycle,
+        "AppLaunchTTI".into(),
+        fields,
+        vec![],
+        None,
+        false,
+      );
+    })
   }
 }
 
diff --git a/platform/swift/source/Logger.swift b/platform/swift/source/Logger.swift
index b4406d1d2..551449e8e 100644
--- a/platform/swift/source/Logger.swift
+++ b/platform/swift/source/Logger.swift
@@ -442,6 +442,10 @@ extension Logger: Logging {
         self.deviceCodeController.createTemporaryDeviceCode(deviceID: self.deviceID, completion: completion)
     }
 
+    public func logAppLaunchTTI(duration: TimeInterval) {
+        self.underlyingLogger.logAppLaunchTTI(duration: duration)
+    }
+
     public func startSpan(
         name: String,
         level: LogLevel,
@@ -462,10 +466,6 @@ extension Logger: Logging {
             timeProvider: self.timeProvider
         )
     }
-
-    public func logAppLaunchTTI(duration: TimeInterval) {
-        self.underlyingLogger.logAppLaunchTTI(duration: duration)
-    }
 }
 
 // MARK: - Features
diff --git a/platform/swift/source/Logging.swift b/platform/swift/source/Logging.swift
index 927d3203e..cfe829384 100644
--- a/platform/swift/source/Logging.swift
+++ b/platform/swift/source/Logging.swift
@@ -95,6 +95,17 @@ public protocol Logging {
     ///                         main queue.
     func createTemporaryDeviceCode(completion: @escaping (Result<String, Error>) -> Void)
 
+    // MARK: - Predefined logs
+
+    /// Writes an app launch TTI log event. This event should be logged only once per Logger configuration.
+    /// Consecutive calls have no effect.
+    ///
+    /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
+    ///                       interactive.
+    func logAppLaunchTTI(duration: TimeInterval)
+
+    // MARK: - Spans
+
     /// Signals that an operation has started at this point in time. Each operation consists of start and
     /// end event logs. The start event is emitted immediately upon calling the `startSpan(...)` method,
     /// while the corresponding end event is emitted when the `end(...)` method is called on the `Span`
@@ -112,8 +123,6 @@ public protocol Logging {
     func startSpan(
         name: String, level: LogLevel, file: String?, line: Int?, function: String?, fields: Fields?
     ) -> Span
-
-    func logAppLaunchTTI(duration: TimeInterval)
 }
 
 extension Logging {

From dd0ca45d0f1286b1b73f2a15fb811b3fd34924b0 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Wed, 28 Aug 2024 17:08:08 -0400
Subject: [PATCH 04/15] better docs

---
 .../kotlin/io/bitdrift/capture/CaptureJniLibrary.kt   |  3 ++-
 platform/shared/src/lib.rs                            |  5 +++--
 platform/swift/source/CaptureRustBridge.h             | 11 ++++++-----
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
index 6010ec587..e78d6e0d6 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
@@ -230,7 +230,8 @@ internal object CaptureJniLibrary {
     )
 
     /**
-     * Writes an app launch TTI log.
+     * Writes an app launch TTI log. The method should be called only once per logger Id. Consecutive calls
+     * have no effect.
      *
      * @param loggerId the ID of the logger to write to.
      * @param durationS the time between a user's intent to launch the app and when the app becomes
diff --git a/platform/shared/src/lib.rs b/platform/shared/src/lib.rs
index f86c00ca6..eab778982 100644
--- a/platform/shared/src/lib.rs
+++ b/platform/shared/src/lib.rs
@@ -163,7 +163,8 @@ impl LoggerHolder {
     drop(holder);
   }
 
-  /// Logs an out-of-the-box app launch TTI log event.
+  /// Logs an out-of-the-box app launch TTI log event. The method should be called only once.
+  /// Consecutive calls have not effect.
   pub fn log_app_launch_tti(&self, duration: time::Duration) {
     self.app_launch_tti_log.call_once(|| {
       let fields = vec![AnnotatedLogField {
@@ -173,7 +174,7 @@ impl LoggerHolder {
         },
         kind: LogFieldKind::Ootb,
       }];
-  
+
       self.log(
         log_level::INFO,
         LogType::Lifecycle,
diff --git a/platform/swift/source/CaptureRustBridge.h b/platform/swift/source/CaptureRustBridge.h
index edf2a2878..4af16cb17 100644
--- a/platform/swift/source/CaptureRustBridge.h
+++ b/platform/swift/source/CaptureRustBridge.h
@@ -137,26 +137,27 @@ bool capture_should_write_app_update_log(
  * @param app_version the version of the app.
  * @param build_number the app build number.
  * @param app_install_size_bytes the size of the app in bytes.
- * @param duration_ms the duration of time the preparation of the log took.
+ * @param duration_s the duration of time the preparation of the log took.
  */
 void capture_write_app_update_log(
     logger_id logger_id,
     NSString *app_version,
     NSString *build_number,
     uint64_t app_install_size_bytes,
-    double duration_ms
+    double duration_s
 );
 
 /*
- * Writes an app launch TTI log.
+ * Writes an app launch TTI log. The method should be called only once per logger Id. Consecutive calls
+ * have no effect.
  *
  * @param loggerId the ID of the logger to write to.
- * @param duration_ms the duration of time between a user's intent to launch an app and the point in time 
+ * @param duration_s the duration of time between a user's intent to launch an app and the point in time 
  *        when the app became interactive.
  */
 void capture_write_app_launch_tti_log(
     logger_id logger_id,
-    double duration_ms
+    double duration_s
 );
 
 /*

From b3d50a2bebf36f2ff663169527c60c07facd080a Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 10:30:19 -0400
Subject: [PATCH 05/15] clippy fixes

---
 platform/shared/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/platform/shared/src/lib.rs b/platform/shared/src/lib.rs
index eab778982..9e23aa29c 100644
--- a/platform/shared/src/lib.rs
+++ b/platform/shared/src/lib.rs
@@ -184,7 +184,7 @@ impl LoggerHolder {
         None,
         false,
       );
-    })
+    });
   }
 }
 

From 6a5b61ab11dd16ff6c636f20905ad82cca3de730 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 10:34:35 -0400
Subject: [PATCH 06/15] :hammer:


From 66a81340dfd706b52a52409b1a256f4adbc09692 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 10:36:24 -0400
Subject: [PATCH 07/15] fix symbols

---
 platform/jvm/jni_symbols.lds | 1 +
 1 file changed, 1 insertion(+)

diff --git a/platform/jvm/jni_symbols.lds b/platform/jvm/jni_symbols.lds
index b8a376ad9..8c51ce4d7 100644
--- a/platform/jvm/jni_symbols.lds
+++ b/platform/jvm/jni_symbols.lds
@@ -15,6 +15,7 @@ Java_io_bitdrift_capture_CaptureJniLibrary_writeResourceUtilizationLog
 Java_io_bitdrift_capture_CaptureJniLibrary_writeSDKConfiguredLog
 Java_io_bitdrift_capture_CaptureJniLibrary_shouldWriteAppUpdateLog
 Java_io_bitdrift_capture_CaptureJniLibrary_writeAppUpdateLog
+Java_io_bitdrift_capture_CaptureJniLibrary_writeAppLaunchTTILog
 Java_io_bitdrift_capture_CaptureJniLibrary_flush
 Java_io_bitdrift_capture_CaptureJniLibrary_debugDebug
 Java_io_bitdrift_capture_CaptureJniLibrary_debugError

From f47b8ed444316ffbd4842a45f09af6ef02079ffd Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 10:41:01 -0400
Subject: [PATCH 08/15] Remove @JvmOverloads

---
 .../jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt   | 1 -
 1 file changed, 1 deletion(-)

diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
index 6a314b9c8..82b9a024e 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
@@ -287,7 +287,6 @@ object Capture {
          *                 interactive.
          */
         @JvmStatic
-        @JvmOverloads
         fun logAppLaunchTTI(duration: Duration) {
             logger()?.logAppLaunchTTI(duration)
         }

From d80b904556e394639952e62bca2cbe76b0e31231 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 10:59:26 -0400
Subject: [PATCH 09/15] fix mocks

---
 .../platform/swift/unit_integration/mocks/MockCoreLogging.swift | 2 ++
 .../swift/unit_integration/mocks/MockLoggerBridging.swift       | 2 ++
 test/platform/swift/unit_integration/mocks/MockLogging.swift    | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift b/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
index 7bf2fca33..79234c594 100644
--- a/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
@@ -124,6 +124,8 @@ extension MockCoreLogging: CoreLogging {
         self.logAppUpdateExpectation?.fulfill()
     }
 
+    func logAppLaunchTTI(duration _: TimeInterval) {}
+
     func addField(withKey _: String, value _: String) {}
 
     func removeField(withKey _: String) {}
diff --git a/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift b/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
index 7609f8cf4..fa64bfb7f 100644
--- a/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
@@ -94,6 +94,8 @@ extension MockLoggerBridging: LoggerBridging {
         self.logAppUpdateExpectation?.fulfill()
     }
 
+    func logAppLaunchTTI(duration _: TimeInterval) {}
+
     func addField(withKey _: String, value _: String) {}
 
     func removeField(withKey _: String) {}
diff --git a/test/platform/swift/unit_integration/mocks/MockLogging.swift b/test/platform/swift/unit_integration/mocks/MockLogging.swift
index 386920d7e..748cbbc67 100644
--- a/test/platform/swift/unit_integration/mocks/MockLogging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockLogging.swift
@@ -109,6 +109,8 @@ extension MockLogging: Logging {
         self.onLog(log)
     }
 
+    func logAppLaunchTTI(duration _: TimeInterval) {}
+
     func addField(withKey _: String, value _: FieldValue) {}
 
     func removeField(withKey _: String) {}

From ca3cd4282ce8fbc190cf47e376393ae34b343731 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 14:08:06 -0400
Subject: [PATCH 10/15] ignore negative durations

---
 Cargo.lock                          |  1 +
 platform/shared/Cargo.toml          |  1 +
 platform/shared/src/lib.rs          | 11 ++++++++++-
 platform/swift/source/Capture.swift |  4 ++--
 platform/swift/source/Logger.swift  |  4 ++--
 platform/swift/source/Logging.swift |  2 +-
 6 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index eb7e10786..489ff7087 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1879,6 +1879,7 @@ dependencies = [
  "bd-logger",
  "bd-runtime",
  "bd-session",
+ "log",
  "parking_lot",
  "pretty_assertions",
  "regex",
diff --git a/platform/shared/Cargo.toml b/platform/shared/Cargo.toml
index b5104d8fb..1fab6c5ed 100644
--- a/platform/shared/Cargo.toml
+++ b/platform/shared/Cargo.toml
@@ -14,6 +14,7 @@ bd-log-primitives.workspace     = true
 bd-logger.workspace             = true
 bd-runtime.workspace            = true
 bd-session.workspace            = true
+log.workspace                   = true
 parking_lot.workspace           = true
 regex.workspace                 = true
 time.workspace                  = true
diff --git a/platform/shared/src/lib.rs b/platform/shared/src/lib.rs
index 9e23aa29c..c8c5f66d2 100644
--- a/platform/shared/src/lib.rs
+++ b/platform/shared/src/lib.rs
@@ -167,10 +167,19 @@ impl LoggerHolder {
   /// Consecutive calls have not effect.
   pub fn log_app_launch_tti(&self, duration: time::Duration) {
     self.app_launch_tti_log.call_once(|| {
+      let duration_ms = duration.as_seconds_f64() * 1_000f64;
+      if duration_ms < 0.0 {
+        log::warn!(
+          "dropping app launch TTI log: reported TTI is negative: {}",
+          duration_ms
+        );
+        return;
+      }
+
       let fields = vec![AnnotatedLogField {
         field: LogField {
           key: "_duration_ms".into(),
-          value: (duration.as_seconds_f64() * 1_000f64).to_string().into(),
+          value: duration_ms.to_string().into(),
         },
         kind: LogFieldKind::Ootb,
       }];
diff --git a/platform/swift/source/Capture.swift b/platform/swift/source/Capture.swift
index 6b9518bd6..71babe22f 100644
--- a/platform/swift/source/Capture.swift
+++ b/platform/swift/source/Capture.swift
@@ -268,8 +268,8 @@ extension Logger {
     ///
     /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
     ///                       interactive.
-    public static func logAppLaunchTTI(duration: TimeInterval) {
-        Self.getShared()?.logAppLaunchTTI(duration: duration)
+    public static func logAppLaunchTTI(_ duration: TimeInterval) {
+        Self.getShared()?.logAppLaunchTTI(duration)
     }
 
     // MARK: - Network Activity Logging
diff --git a/platform/swift/source/Logger.swift b/platform/swift/source/Logger.swift
index 551449e8e..ab0328fb3 100644
--- a/platform/swift/source/Logger.swift
+++ b/platform/swift/source/Logger.swift
@@ -442,8 +442,8 @@ extension Logger: Logging {
         self.deviceCodeController.createTemporaryDeviceCode(deviceID: self.deviceID, completion: completion)
     }
 
-    public func logAppLaunchTTI(duration: TimeInterval) {
-        self.underlyingLogger.logAppLaunchTTI(duration: duration)
+    public func logAppLaunchTTI(_ duration: TimeInterval) {
+        self.underlyingLogger.logAppLaunchTTI(duration)
     }
 
     public func startSpan(
diff --git a/platform/swift/source/Logging.swift b/platform/swift/source/Logging.swift
index cfe829384..32cf2cde4 100644
--- a/platform/swift/source/Logging.swift
+++ b/platform/swift/source/Logging.swift
@@ -102,7 +102,7 @@ public protocol Logging {
     ///
     /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
     ///                       interactive.
-    func logAppLaunchTTI(duration: TimeInterval)
+    func logAppLaunchTTI(_ duration: TimeInterval)
 
     // MARK: - Spans
 

From 0b33aa4ee2b34023c7cabd37ee6923626b014bf6 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 21:47:10 -0400
Subject: [PATCH 11/15] update lock, add docs per cr

---
 Cargo.Bazel.lock                                            | 6 +++++-
 .../capture/src/main/kotlin/io/bitdrift/capture/Capture.kt  | 2 +-
 .../main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt    | 4 ++--
 .../capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt  | 2 +-
 platform/swift/source/Capture.swift                         | 2 +-
 platform/swift/source/Logging.swift                         | 2 +-
 6 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/Cargo.Bazel.lock b/Cargo.Bazel.lock
index 5cda1540e..0ef07b77b 100644
--- a/Cargo.Bazel.lock
+++ b/Cargo.Bazel.lock
@@ -1,5 +1,5 @@
 {
-  "checksum": "1c0b0ba664ad4b267d43db44407b2f5a8066bbe33d272fbb409fa397d1ee03d8",
+  "checksum": "2593290c0a2b86dae2b0a2622e5d06ee4ce660618e1c93511ec7c306f6429466",
   "crates": {
     "addr2line 0.22.0": {
       "name": "addr2line",
@@ -11205,6 +11205,10 @@
               "id": "bd-session 1.0.0",
               "target": "bd_session"
             },
+            {
+              "id": "log 0.4.22",
+              "target": "log"
+            },
             {
               "id": "parking_lot 0.12.3",
               "target": "parking_lot"
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
index 82b9a024e..4032db39a 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/Capture.kt
@@ -284,7 +284,7 @@ object Capture {
          * Consecutive calls have no effect.
          *
          * @param duration The time between a user's intent to launch the app and when the app becomes
-         *                 interactive.
+         *                 interactive. Calls with a negative duration are ignored.
          */
         @JvmStatic
         fun logAppLaunchTTI(duration: Duration) {
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
index e78d6e0d6..347d2c6e0 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
@@ -219,7 +219,7 @@ internal object CaptureJniLibrary {
      * @param appVersion
      * @param appVersionCode
      * @param appInstallSizeBytes the size of the app installation. Expressed in bytes.
-     * @param durationS the duration of time the preparation of the log took.
+     * @param durationS the duration of time the preparation of the log took. Expressed in seconds.
      */
     external fun writeAppUpdateLog(
         loggerId: Long,
@@ -235,7 +235,7 @@ internal object CaptureJniLibrary {
      *
      * @param loggerId the ID of the logger to write to.
      * @param durationS the time between a user's intent to launch the app and when the app becomes
-     *                  interactive.
+     *                  interactive. Expressed in seconds.
      */
     external fun writeAppLaunchTTILog(
         loggerId: Long,
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt
index 299ab3c1c..9d1c98edc 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/ILogger.kt
@@ -91,7 +91,7 @@ interface ILogger {
      * Consecutive calls have no effect.
      *
      * @param duration The time between a user's intent to launch the app and when the app becomes
-     *                 interactive.
+     *                 interactive. Calls with a negative duration are ignored.
      */
     fun logAppLaunchTTI(duration: Duration)
 
diff --git a/platform/swift/source/Capture.swift b/platform/swift/source/Capture.swift
index 71babe22f..f2fe5b55c 100644
--- a/platform/swift/source/Capture.swift
+++ b/platform/swift/source/Capture.swift
@@ -267,7 +267,7 @@ extension Logger {
     /// Consecutive calls have no effect.
     ///
     /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
-    ///                       interactive.
+    ///                       interactive. Calls with a negative duration are ignored.
     public static func logAppLaunchTTI(_ duration: TimeInterval) {
         Self.getShared()?.logAppLaunchTTI(duration)
     }
diff --git a/platform/swift/source/Logging.swift b/platform/swift/source/Logging.swift
index 32cf2cde4..a90cff52f 100644
--- a/platform/swift/source/Logging.swift
+++ b/platform/swift/source/Logging.swift
@@ -101,7 +101,7 @@ public protocol Logging {
     /// Consecutive calls have no effect.
     ///
     /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
-    ///                       interactive.
+    ///                       interactive. Calls with a negative duration are ignored.
     func logAppLaunchTTI(_ duration: TimeInterval)
 
     // MARK: - Spans

From 89814679cd1ff1315a70dc9db28355e446132f59 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 21:58:25 -0400
Subject: [PATCH 12/15] fix lock

---
 Cargo.Bazel.lock | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Cargo.Bazel.lock b/Cargo.Bazel.lock
index 6d1a907d1..d4688f39e 100644
--- a/Cargo.Bazel.lock
+++ b/Cargo.Bazel.lock
@@ -1,5 +1,5 @@
 {
-  "checksum": "56425165453d96ae5bf70ff6018fcb7c04df849e34a7e81588062e458fd2a43b",
+  "checksum": "8ad31ce9dea7ee209cf012275ebd9379bd6f5ccc1ba1f90281d98b110fbb673f",
   "crates": {
     "addr2line 0.22.0": {
       "name": "addr2line",

From a4d84633d2cbc6afd3118ab2af5a7c895aa3bae3 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 22:05:41 -0400
Subject: [PATCH 13/15] remove duration label

---
 examples/swift/hello_world/LoggerCustomer.swift               | 2 +-
 .../src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt  | 2 +-
 platform/swift/source/CoreLogger.swift                        | 4 ++--
 platform/swift/source/CoreLogging.swift                       | 2 +-
 platform/swift/source/LoggerBridge.swift                      | 2 +-
 platform/swift/source/LoggerBridging.swift                    | 2 +-
 6 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/examples/swift/hello_world/LoggerCustomer.swift b/examples/swift/hello_world/LoggerCustomer.swift
index 396c46564..22e48e41f 100644
--- a/examples/swift/hello_world/LoggerCustomer.swift
+++ b/examples/swift/hello_world/LoggerCustomer.swift
@@ -166,7 +166,7 @@ final class LoggerCustomer: NSObject, URLSessionDelegate {
     }
 
     func logAppLaunchTTI() {
-        Logger.logAppLaunchTTI(duration: Date().timeIntervalSince(self.appStartTime))
+        Logger.logAppLaunchTTI(Date().timeIntervalSince(self.appStartTime))
     }
 }
 
diff --git a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
index 347d2c6e0..6e51bf73a 100644
--- a/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
+++ b/platform/jvm/capture/src/main/kotlin/io/bitdrift/capture/CaptureJniLibrary.kt
@@ -235,7 +235,7 @@ internal object CaptureJniLibrary {
      *
      * @param loggerId the ID of the logger to write to.
      * @param durationS the time between a user's intent to launch the app and when the app becomes
-     *                  interactive. Expressed in seconds.
+     *                  interactive. Expressed in seconds. Calls with a negative duration are ignored.
      */
     external fun writeAppLaunchTTILog(
         loggerId: Long,
diff --git a/platform/swift/source/CoreLogger.swift b/platform/swift/source/CoreLogger.swift
index f6082e7f3..e88d63129 100644
--- a/platform/swift/source/CoreLogger.swift
+++ b/platform/swift/source/CoreLogger.swift
@@ -120,8 +120,8 @@ extension CoreLogger: CoreLogging {
         )
     }
 
-    func logAppLaunchTTI(duration: TimeInterval) {
-        self.underlyingLogger.logAppLaunchTTI(duration: duration)
+    func logAppLaunchTTI(_ duration: TimeInterval) {
+        self.underlyingLogger.logAppLaunchTTI(duration)
     }
 
     func startNewSession() {
diff --git a/platform/swift/source/CoreLogging.swift b/platform/swift/source/CoreLogging.swift
index 35bd15bc0..93197624d 100644
--- a/platform/swift/source/CoreLogging.swift
+++ b/platform/swift/source/CoreLogging.swift
@@ -94,7 +94,7 @@ protocol CoreLogging: AnyObject {
     ///
     /// - parameter duration: The time between a user's intent to launch the app and when the app becomes
     ///                       interactive.
-    func logAppLaunchTTI(duration: TimeInterval)
+    func logAppLaunchTTI(_ duration: TimeInterval)
 
     /// Stars new session using configured session strategy.
     func startNewSession()
diff --git a/platform/swift/source/LoggerBridge.swift b/platform/swift/source/LoggerBridge.swift
index 17ce03517..41d68166c 100644
--- a/platform/swift/source/LoggerBridge.swift
+++ b/platform/swift/source/LoggerBridge.swift
@@ -127,7 +127,7 @@ final class LoggerBridge: LoggerBridging {
         capture_write_app_update_log(self.loggerID, appVersion, buildNumber, appSizeBytes, duration)
     }
 
-    func logAppLaunchTTI(duration: TimeInterval) {
+    func logAppLaunchTTI(_ duration: TimeInterval) {
         capture_write_app_launch_tti_log(self.loggerID, duration)
     }
 
diff --git a/platform/swift/source/LoggerBridging.swift b/platform/swift/source/LoggerBridging.swift
index d5746ad5f..7cc236915 100644
--- a/platform/swift/source/LoggerBridging.swift
+++ b/platform/swift/source/LoggerBridging.swift
@@ -41,7 +41,7 @@ protocol LoggerBridging {
         duration: TimeInterval
     )
 
-    func logAppLaunchTTI(duration: TimeInterval)
+    func logAppLaunchTTI(_ duration: TimeInterval)
 
     func start()
 

From 50508c8253dcb32293e38905f67ef11de06a5396 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Thu, 29 Aug 2024 23:32:36 -0400
Subject: [PATCH 14/15] fix

---
 .../platform/swift/unit_integration/mocks/MockCoreLogging.swift | 2 +-
 .../swift/unit_integration/mocks/MockLoggerBridging.swift       | 2 +-
 test/platform/swift/unit_integration/mocks/MockLogging.swift    | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift b/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
index 79234c594..e05ebcdac 100644
--- a/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
@@ -124,7 +124,7 @@ extension MockCoreLogging: CoreLogging {
         self.logAppUpdateExpectation?.fulfill()
     }
 
-    func logAppLaunchTTI(duration _: TimeInterval) {}
+    func logAppLaunchTTI(_ duration: TimeInterval) {}
 
     func addField(withKey _: String, value _: String) {}
 
diff --git a/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift b/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
index fa64bfb7f..b0a908063 100644
--- a/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
@@ -94,7 +94,7 @@ extension MockLoggerBridging: LoggerBridging {
         self.logAppUpdateExpectation?.fulfill()
     }
 
-    func logAppLaunchTTI(duration _: TimeInterval) {}
+    func logAppLaunchTTI(_ duration: TimeInterval) {}
 
     func addField(withKey _: String, value _: String) {}
 
diff --git a/test/platform/swift/unit_integration/mocks/MockLogging.swift b/test/platform/swift/unit_integration/mocks/MockLogging.swift
index 748cbbc67..8838e3150 100644
--- a/test/platform/swift/unit_integration/mocks/MockLogging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockLogging.swift
@@ -109,7 +109,7 @@ extension MockLogging: Logging {
         self.onLog(log)
     }
 
-    func logAppLaunchTTI(duration _: TimeInterval) {}
+    func logAppLaunchTTI(_ duration: TimeInterval) {}
 
     func addField(withKey _: String, value _: FieldValue) {}
 

From c31c75989c1e55923abbb0f1a9f50f24aed52691 Mon Sep 17 00:00:00 2001
From: Rafal Augustyniak <rafalaugustyniak@gmail.com>
Date: Fri, 30 Aug 2024 07:50:17 -0400
Subject: [PATCH 15/15] format fix

---
 .../platform/swift/unit_integration/mocks/MockCoreLogging.swift | 2 +-
 .../swift/unit_integration/mocks/MockLoggerBridging.swift       | 2 +-
 test/platform/swift/unit_integration/mocks/MockLogging.swift    | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift b/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
index e05ebcdac..718371516 100644
--- a/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockCoreLogging.swift
@@ -124,7 +124,7 @@ extension MockCoreLogging: CoreLogging {
         self.logAppUpdateExpectation?.fulfill()
     }
 
-    func logAppLaunchTTI(_ duration: TimeInterval) {}
+    func logAppLaunchTTI(_: TimeInterval) {}
 
     func addField(withKey _: String, value _: String) {}
 
diff --git a/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift b/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
index b0a908063..5fd833b12 100644
--- a/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockLoggerBridging.swift
@@ -94,7 +94,7 @@ extension MockLoggerBridging: LoggerBridging {
         self.logAppUpdateExpectation?.fulfill()
     }
 
-    func logAppLaunchTTI(_ duration: TimeInterval) {}
+    func logAppLaunchTTI(_: TimeInterval) {}
 
     func addField(withKey _: String, value _: String) {}
 
diff --git a/test/platform/swift/unit_integration/mocks/MockLogging.swift b/test/platform/swift/unit_integration/mocks/MockLogging.swift
index 8838e3150..b7db23649 100644
--- a/test/platform/swift/unit_integration/mocks/MockLogging.swift
+++ b/test/platform/swift/unit_integration/mocks/MockLogging.swift
@@ -109,7 +109,7 @@ extension MockLogging: Logging {
         self.onLog(log)
     }
 
-    func logAppLaunchTTI(_ duration: TimeInterval) {}
+    func logAppLaunchTTI(_: TimeInterval) {}
 
     func addField(withKey _: String, value _: FieldValue) {}