RUM-5248 feat: send memory warning as RUM error

CHANGELOG.md

@@ -1,7 +1,8 @@
 # Unreleased
 
-- [FEATURE] Enable DatadogCore, DatadogLogs and DatadogTrace to compile on watchOS platform. See [#1918][] (Thanks [@jfiser-paylocity][]) [#1946][] 
+- [FEATURE] Enable DatadogCore, DatadogLogs and DatadogTrace to compile on watchOS platform. See [#1918][] (Thanks [@jfiser-paylocity][]) [#1946][]
 - [IMPROVEMENT] Ability to clear feature data storage using `clearAllData` API. See [#1940][]
+- [IMPROVEMENT] Send memory warning as RUM error. See [#1955][]
 
 # 2.14.1 / 09-07-2024
 
@@ -723,6 +724,7 @@ Release `2.0` introduces breaking changes. Follow the [Migration Guide](MIGRATIO
 [#1947]: https://github.com/DataDog/dd-sdk-ios/pull/1947
 [#1948]: https://github.com/DataDog/dd-sdk-ios/pull/1948
 [#1940]: https://github.com/DataDog/dd-sdk-ios/pull/1940
+[#1955]: https://github.com/DataDog/dd-sdk-ios/pull/1955
 [@00fa9a]: https://github.com/00FA9A
 [@britton-earnin]: https://github.com/Britton-Earnin
 [@hengyu]: https://github.com/Hengyu

Datadog/Datadog.xcodeproj/project.pbxproj

@@ -47,6 +47,16 @@
 		3C41693C29FBF4D50042B9D2 /* DatadogWebViewTracking.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3CE119FE29F7BE0100202522 /* DatadogWebViewTracking.framework */; };
 		3C43A3882C188974000BFB21 /* WatchdogTerminationMonitorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C43A3862C188970000BFB21 /* WatchdogTerminationMonitorTests.swift */; };
 		3C43A3892C188975000BFB21 /* WatchdogTerminationMonitorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C43A3862C188970000BFB21 /* WatchdogTerminationMonitorTests.swift */; };
+		3C4CF9912C47BE07006DE1C0 /* MemoryWarningMonitor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5CD8C12C3EBA1700B12303 /* MemoryWarningMonitor.swift */; };
+		3C4CF9922C47BE07006DE1C0 /* MemoryWarningMonitor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5CD8C12C3EBA1700B12303 /* MemoryWarningMonitor.swift */; };
+		3C4CF9942C47CAE9006DE1C0 /* MemoryWarning.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5CD8C42C3EC61500B12303 /* MemoryWarning.swift */; };
+		3C4CF9952C47CAEA006DE1C0 /* MemoryWarning.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5CD8C42C3EC61500B12303 /* MemoryWarning.swift */; };
+		3C4CF9982C47CC91006DE1C0 /* MemoryWarningMonitorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C4CF9972C47CC8C006DE1C0 /* MemoryWarningMonitorTests.swift */; };
+		3C4CF9992C47CC92006DE1C0 /* MemoryWarningMonitorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C4CF9972C47CC8C006DE1C0 /* MemoryWarningMonitorTests.swift */; };
+		3C4CF99B2C47DAA5006DE1C0 /* MemoryWarningMocks.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C4CF99A2C47DAA5006DE1C0 /* MemoryWarningMocks.swift */; };
+		3C4CF99C2C47DAA5006DE1C0 /* MemoryWarningMocks.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C4CF99A2C47DAA5006DE1C0 /* MemoryWarningMocks.swift */; };
+		3C5CD8CD2C3ECB9400B12303 /* MemoryWarningReporter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5CD8CA2C3ECB4800B12303 /* MemoryWarningReporter.swift */; };
+		3C5CD8CE2C3ECB9400B12303 /* MemoryWarningReporter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5CD8CA2C3ECB4800B12303 /* MemoryWarningReporter.swift */; };
 		3C5D63692B55512B00FEB4BA /* OTelTraceState+Datadog.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5D63682B55512B00FEB4BA /* OTelTraceState+Datadog.swift */; };
 		3C5D636A2B55512B00FEB4BA /* OTelTraceState+Datadog.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5D63682B55512B00FEB4BA /* OTelTraceState+Datadog.swift */; };
 		3C5D636C2B55513500FEB4BA /* OTelTraceState+DatadogTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5D636B2B55513500FEB4BA /* OTelTraceState+DatadogTests.swift */; };
@@ -2108,6 +2118,11 @@
 		3C33E4062BEE35A7003B2988 /* RUMContextMocks.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RUMContextMocks.swift; sourceTree = "<group>"; };
 		3C3EF2AF2C1AEBAB009E9E57 /* LaunchReport.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LaunchReport.swift; sourceTree = "<group>"; };
 		3C43A3862C188970000BFB21 /* WatchdogTerminationMonitorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WatchdogTerminationMonitorTests.swift; sourceTree = "<group>"; };
+		3C4CF9972C47CC8C006DE1C0 /* MemoryWarningMonitorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MemoryWarningMonitorTests.swift; sourceTree = "<group>"; };
+		3C4CF99A2C47DAA5006DE1C0 /* MemoryWarningMocks.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MemoryWarningMocks.swift; sourceTree = "<group>"; };
+		3C5CD8C12C3EBA1700B12303 /* MemoryWarningMonitor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MemoryWarningMonitor.swift; sourceTree = "<group>"; };
+		3C5CD8C42C3EC61500B12303 /* MemoryWarning.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MemoryWarning.swift; sourceTree = "<group>"; };
+		3C5CD8CA2C3ECB4800B12303 /* MemoryWarningReporter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MemoryWarningReporter.swift; sourceTree = "<group>"; };
 		3C5D63682B55512B00FEB4BA /* OTelTraceState+Datadog.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "OTelTraceState+Datadog.swift"; sourceTree = "<group>"; };
 		3C5D636B2B55513500FEB4BA /* OTelTraceState+DatadogTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "OTelTraceState+DatadogTests.swift"; sourceTree = "<group>"; };
 		3C62C3602C3E852F00C7E336 /* MultiSelector.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MultiSelector.swift; sourceTree = "<group>"; };
@@ -3406,6 +3421,25 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		3C4CF9932C47BE10006DE1C0 /* MemoryWarnings */ = {
+			isa = PBXGroup;
+			children = (
+				3C5CD8C42C3EC61500B12303 /* MemoryWarning.swift */,
+				3C5CD8C12C3EBA1700B12303 /* MemoryWarningMonitor.swift */,
+				3C5CD8CA2C3ECB4800B12303 /* MemoryWarningReporter.swift */,
+			);
+			path = MemoryWarnings;
+			sourceTree = "<group>";
+		};
+		3C4CF9962C47CC72006DE1C0 /* MemoryWarnings */ = {
+			isa = PBXGroup;
+			children = (
+				3C4CF9972C47CC8C006DE1C0 /* MemoryWarningMonitorTests.swift */,
+				3C4CF99A2C47DAA5006DE1C0 /* MemoryWarningMocks.swift */,
+			);
+			path = MemoryWarnings;
+			sourceTree = "<group>";
+		};
 		3C68FCD12C05EE8E00723696 /* WatchdogTerminations */ = {
 			isa = PBXGroup;
 			children = (
@@ -4814,6 +4848,7 @@
 		616CCE11250A181C009FED46 /* Instrumentation */ = {
 			isa = PBXGroup;
 			children = (
+				3C4CF9932C47BE10006DE1C0 /* MemoryWarnings */,
 				616CCE12250A1868009FED46 /* RUMCommandSubscriber.swift */,
 				616CCE15250A467E009FED46 /* RUMInstrumentation.swift */,
 				61F3CDA1251118DD00C816E5 /* Views */,
@@ -5481,6 +5516,7 @@
 		61F3CDA825121F8F00C816E5 /* Instrumentation */ = {
 			isa = PBXGroup;
 			children = (
+				3C4CF9962C47CC72006DE1C0 /* MemoryWarnings */,
 				61F3CDA925121FA100C816E5 /* Views */,
 				6141014C251A577D00E3C2D9 /* Actions */,
 				613F23EF252B1287006CD2D7 /* Resources */,
@@ -8710,8 +8746,10 @@
 				61C713AB2A3B790B00FA735A /* Monitor.swift in Sources */,
 				D23F8E6429DDCD28001CFAE8 /* SwiftUIViewHandler.swift in Sources */,
 				3CFF4F922C09E630006F191D /* WatchdogTerminationAppStateManager.swift in Sources */,
+				3C4CF9952C47CAEA006DE1C0 /* MemoryWarning.swift in Sources */,
 				D23F8E6529DDCD28001CFAE8 /* RUMFeature.swift in Sources */,
 				D23F8E6629DDCD28001CFAE8 /* RUMDebugging.swift in Sources */,
+				3C4CF9912C47BE07006DE1C0 /* MemoryWarningMonitor.swift in Sources */,
 				D23F8E6729DDCD28001CFAE8 /* RUMUUID.swift in Sources */,
 				D23F8E6829DDCD28001CFAE8 /* UIKitExtensions.swift in Sources */,
 				61C713A82A3B78F900FA735A /* RUMMonitorProtocol+Convenience.swift in Sources */,
@@ -8755,6 +8793,7 @@
 				D23F8E8229DDCD28001CFAE8 /* RUMSessionScope.swift in Sources */,
 				D23F8E8329DDCD28001CFAE8 /* RUMUser.swift in Sources */,
 				D23F8E8429DDCD28001CFAE8 /* UIKitRUMUserActionsPredicate.swift in Sources */,
+				3C5CD8CE2C3ECB9400B12303 /* MemoryWarningReporter.swift in Sources */,
 				D23F8E8529DDCD28001CFAE8 /* SwiftUIExtensions.swift in Sources */,
 				3CFF4F952C09E63C006F191D /* WatchdogTerminationChecker.swift in Sources */,
 				D23F8E8629DDCD28001CFAE8 /* RUMDataModelsMapping.swift in Sources */,
@@ -8782,6 +8821,7 @@
 				D23F8EA029DDCD38001CFAE8 /* RUMOffViewEventsHandlingRuleTests.swift in Sources */,
 				61C4534B2C0A0BBF00CC4C17 /* TelemetryInterceptorTests.swift in Sources */,
 				D23F8EA229DDCD38001CFAE8 /* RUMSessionScopeTests.swift in Sources */,
+				3C4CF9992C47CC92006DE1C0 /* MemoryWarningMonitorTests.swift in Sources */,
 				D23F8EA329DDCD38001CFAE8 /* RUMUserActionScopeTests.swift in Sources */,
 				615B0F8C2BB33C2800E9ED6C /* AppHangsMonitorTests.swift in Sources */,
 				61C713B42A3C3A0B00FA735A /* RUMMonitorProtocol+InternalTests.swift in Sources */,
@@ -8801,6 +8841,7 @@
 				61C713B72A3C600400FA735A /* RUMMonitorProtocol+ConvenienceTests.swift in Sources */,
 				D23F8EB129DDCD38001CFAE8 /* RUMViewScopeTests.swift in Sources */,
 				D224431029E977A100274EC7 /* TelemetryReceiverTests.swift in Sources */,
+				3C4CF99C2C47DAA5006DE1C0 /* MemoryWarningMocks.swift in Sources */,
 				3C43A3892C188975000BFB21 /* WatchdogTerminationMonitorTests.swift in Sources */,
 				D23F8EB229DDCD38001CFAE8 /* ValuePublisherTests.swift in Sources */,
 				6174D61B2BFE449300EC7469 /* SessionEndedMetricTests.swift in Sources */,
@@ -9039,8 +9080,10 @@
 				61C713AA2A3B790B00FA735A /* Monitor.swift in Sources */,
 				D29A9F8529DD85BB005C54A4 /* SwiftUIViewHandler.swift in Sources */,
 				3CFF4F912C09E630006F191D /* WatchdogTerminationAppStateManager.swift in Sources */,
+				3C4CF9942C47CAE9006DE1C0 /* MemoryWarning.swift in Sources */,
 				D29A9F7429DD85BB005C54A4 /* RUMFeature.swift in Sources */,
 				D29A9F7729DD85BB005C54A4 /* RUMDebugging.swift in Sources */,
+				3C4CF9922C47BE07006DE1C0 /* MemoryWarningMonitor.swift in Sources */,
 				D29A9F6E29DD85BB005C54A4 /* RUMUUID.swift in Sources */,
 				D29A9F8D29DD8665005C54A4 /* UIKitExtensions.swift in Sources */,
 				61C713A72A3B78F900FA735A /* RUMMonitorProtocol+Convenience.swift in Sources */,
@@ -9084,6 +9127,7 @@
 				D29A9F5C29DD85BB005C54A4 /* RUMSessionScope.swift in Sources */,
 				D29A9F6629DD85BB005C54A4 /* RUMUser.swift in Sources */,
 				D29A9F8229DD85BB005C54A4 /* UIKitRUMUserActionsPredicate.swift in Sources */,
+				3C5CD8CD2C3ECB9400B12303 /* MemoryWarningReporter.swift in Sources */,
 				D29A9F8E29DD8665005C54A4 /* SwiftUIExtensions.swift in Sources */,
 				3CFF4F942C09E63C006F191D /* WatchdogTerminationChecker.swift in Sources */,
 				D29A9F7829DD85BB005C54A4 /* RUMDataModelsMapping.swift in Sources */,
@@ -9111,6 +9155,7 @@
 				D29A9FA629DDB483005C54A4 /* RUMOffViewEventsHandlingRuleTests.swift in Sources */,
 				61C4534A2C0A0BBF00CC4C17 /* TelemetryInterceptorTests.swift in Sources */,
 				D29A9FBD29DDB483005C54A4 /* RUMSessionScopeTests.swift in Sources */,
+				3C4CF9982C47CC91006DE1C0 /* MemoryWarningMonitorTests.swift in Sources */,
 				D29A9FAB29DDB483005C54A4 /* RUMUserActionScopeTests.swift in Sources */,
 				615B0F8B2BB33C2800E9ED6C /* AppHangsMonitorTests.swift in Sources */,
 				61C713B32A3C3A0B00FA735A /* RUMMonitorProtocol+InternalTests.swift in Sources */,
@@ -9130,6 +9175,7 @@
 				61C713B62A3C600400FA735A /* RUMMonitorProtocol+ConvenienceTests.swift in Sources */,
 				D29A9FB829DDB483005C54A4 /* RUMViewScopeTests.swift in Sources */,
 				D224430F29E9779F00274EC7 /* TelemetryReceiverTests.swift in Sources */,
+				3C4CF99B2C47DAA5006DE1C0 /* MemoryWarningMocks.swift in Sources */,
 				3C43A3882C188974000BFB21 /* WatchdogTerminationMonitorTests.swift in Sources */,
 				D29A9F9D29DDB483005C54A4 /* ValuePublisherTests.swift in Sources */,
 				6174D61A2BFE449300EC7469 /* SessionEndedMetricTests.swift in Sources */,

DatadogCore/Sources/Core/MessageBus.swift

@@ -72,7 +72,7 @@ internal final class MessageBus {
     }
 
     /// Removes the given key and its associated receiver from the bus.
-    /// 
+    ///
     /// - Parameter key: The key to remove along with its associated receiver.
     func removeReceiver(forKey key: String) {
         queue.async { self.bus.removeValue(forKey: key) }

DatadogObjc/Sources/RUM/RUMDataModels+objc.swift

@@ -1732,6 +1732,7 @@ public enum DDRUMErrorEventErrorCategory: Int {
         case .appHang?: self = .appHang
         case .exception?: self = .exception
         case .watchdogTermination?: self = .watchdogTermination
+        case .memoryWarning?: self = .memoryWarning
         }
     }
 
@@ -1742,6 +1743,7 @@ public enum DDRUMErrorEventErrorCategory: Int {
         case .appHang: return .appHang
         case .exception: return .exception
         case .watchdogTermination: return .watchdogTermination
+        case .memoryWarning: return .memoryWarning
         }
     }
 
@@ -1750,6 +1752,7 @@ public enum DDRUMErrorEventErrorCategory: Int {
     case appHang
     case exception
     case watchdogTermination
+    case memoryWarning
 }
 
 @objc
@@ -7707,4 +7710,4 @@ public class DDTelemetryConfigurationEventView: NSObject {
 
 // swiftlint:enable force_unwrapping
 
-// Generated from https://github.com/DataDog/rum-events-format/tree/ae8c30a094339995e234fd55831ade0999bf0612
+// Generated from https://github.com/DataDog/rum-events-format/tree/31c73753ff5c954cf9aef475c91ec0b413743f77

DatadogRUM/Sources/DataModels/RUMDataModels.swift

@@ -807,6 +807,7 @@ public struct RUMErrorEvent: RUMDataModel {
             case appHang = "App Hang"
             case exception = "Exception"
             case watchdogTermination = "Watchdog Termination"
+            case memoryWarning = "Memory Warning"
         }
 
         /// Properties for one of the error causes
@@ -4334,4 +4335,4 @@ public struct RUMTelemetryOperatingSystem: Codable {
     }
 }
 
-// Generated from https://github.com/DataDog/rum-events-format/tree/ae8c30a094339995e234fd55831ade0999bf0612
+// Generated from https://github.com/DataDog/rum-events-format/tree/31c73753ff5c954cf9aef475c91ec0b413743f77

DatadogRUM/Sources/Feature/RUMFeature.swift

@@ -108,6 +108,12 @@ internal final class RUMFeature: DatadogRemoteFeature {
             dateProvider: configuration.dateProvider
         )
 
+        let memoryWarningReporter = MemoryWarningReporter()
+        let memoryWarningMonitor = MemoryWarningMonitor(
+            backtraceReporter: core.backtraceReporter,
+            memoryWarningReporter: memoryWarningReporter
+        )
+
         self.instrumentation = RUMInstrumentation(
             featureScope: featureScope,
             uiKitRUMViewsPredicate: configuration.uiKitViewsPredicate,
@@ -119,7 +125,8 @@ internal final class RUMFeature: DatadogRemoteFeature {
             backtraceReporter: core.backtraceReporter,
             fatalErrorContext: dependencies.fatalErrorContext,
             processID: configuration.processID,
-            watchdogTermination: watchdogTermination
+            watchdogTermination: watchdogTermination,
+            memoryWarningMonitor: memoryWarningMonitor
         )
         self.requestBuilder = RequestBuilder(
             customIntakeURL: configuration.customEndpoint,

DatadogRUM/Sources/Instrumentation/MemoryWarnings/MemoryWarning.swift

@@ -0,0 +1,30 @@
+/*
+ * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0.
+ * This product includes software developed at Datadog (https://www.datadoghq.com/).
+ * Copyright 2019-Present Datadog, Inc.
+ */
+
+import Foundation
+import DatadogInternal
+import UIKit
+
+/// Represents a memory warning
+internal struct MemoryWarning {
+    /// The date when the memory warning was received.
+    let date: Date
+
+    /// The backtrace at the moment of memory warning.
+    let backtrace: BacktraceReport?
+
+    /// Creates a new instance of `MemoryWarning
+    /// - Parameters:
+    ///   - date: Date when the memory warning was received.
+    ///   - backtrace: Backtrace at the moment of memory warning.
+    init(
+        date: Date,
+        backtrace: BacktraceReport?
+    ) {
+        self.date = date
+        self.backtrace = backtrace
+    }
+}

DatadogRUM/Sources/Instrumentation/MemoryWarnings/MemoryWarningMonitor.swift

@@ -0,0 +1,50 @@
+/*
+ * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0.
+ * This product includes software developed at Datadog (https://www.datadoghq.com/).
+ * Copyright 2019-Present Datadog, Inc.
+ */
+
+import Foundation
+import DatadogInternal
+import UIKit
+
+/// Tracks the memory warnings history and publishes it to the subscribers.
+internal final class MemoryWarningMonitor {
+    let notificationCenter: NotificationCenter
+    let backtraceReporter: BacktraceReporting?
+    let reporter: MemoryWarningReporting
+
+    init(
+        backtraceReporter: BacktraceReporting?,
+        memoryWarningReporter: MemoryWarningReporting,
+        notificationCenter: NotificationCenter = .default
+    ) {
+        self.notificationCenter = notificationCenter
+        self.backtraceReporter = backtraceReporter
+        self.reporter = memoryWarningReporter
+    }
+
+    /// Starts monitoring memory warnings by subscribing to `UIApplication.didReceiveMemoryWarningNotification`.
+    func start() {
+        notificationCenter.addObserver(self, selector: #selector(didReceiveMemoryWarning), name: UIApplication.didReceiveMemoryWarningNotification, object: nil)
+    }
+
+    @objc
+    func didReceiveMemoryWarning() {
+        let date: Date = .init()
+        let backtrace: BacktraceReport?
+        do {
+            backtrace = try backtraceReporter?.generateBacktrace()
+        } catch {
+            backtrace = nil
+        }
+        let warning = MemoryWarning(date: date, backtrace: backtrace)
+
+        reporter.report(warning: warning)
+    }
+
+    /// Stops monitoring memory warnings.
+    func stop() {
+        notificationCenter.removeObserver(self)
+    }
+}

DatadogRUM/Sources/Instrumentation/MemoryWarnings/MemoryWarningReporter.swift

@@ -0,0 +1,50 @@
+/*
+ * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0.
+ * This product includes software developed at Datadog (https://www.datadoghq.com/).
+ * Copyright 2019-2020 Datadog, Inc.
+ */
+
+import Foundation
+import DatadogInternal
+import UIKit
+
+/// Defines operations used for reporting memory warnings.
+internal protocol MemoryWarningReporting: RUMCommandPublisher {
+    /// Reports the given memory warning.
+    /// - Parameter warning: The memory warning to report.
+    func report(warning: MemoryWarning)
+}
+
+/// Receives memory warnings and reports them as RUM errors.
+internal class MemoryWarningReporter: MemoryWarningReporting {
+    enum Constants {
+        /// The standardized `error.message` for RUM errors describing a memory warning.
+        static let memoryWarningErrorMessage = "Memory Warning"
+        /// The standardized `error.type` for RUM errors describing a memory warning.
+        static let memoryWarningErrorType = "MemoryWarning"
+        /// The standardized `error.stack` when backtrace generation was not available.
+        static let memoryWarningStackNotAvailableErrorMessage = "Stack trace was not generated because `DatadogCrashReporting` had not been enabled."
+    }
+
+    private(set) weak var subscriber: RUMCommandSubscriber?
+
+    /// Reports the given memory warning as a RUM error.
+    /// - Parameter warning: The memory warning to report.
+    func report(warning: MemoryWarning) {
+        let command = RUMAddCurrentViewMemoryWarningCommand(
+            time: warning.date,
+            attributes: [:],
+            message: Constants.memoryWarningErrorMessage,
+            type: Constants.memoryWarningErrorType,
+            stack: warning.backtrace?.stack ?? Constants.memoryWarningStackNotAvailableErrorMessage,
+            threads: warning.backtrace?.threads,
+            binaryImages: warning.backtrace?.binaryImages,
+            isStackTraceTruncated: warning.backtrace?.wasTruncated
+        )
+        subscriber?.process(command: command)
+    }
+
+    func publish(to subscriber: any RUMCommandSubscriber) {
+        self.subscriber = subscriber
+    }
+}