From 5ed4bee8534ebc9733c60b1aa1661bc9d7e327ee Mon Sep 17 00:00:00 2001
From: Philipp Hofmann <philipp.hofmann@sentry.io>
Date: Tue, 6 Dec 2022 09:57:05 +0100
Subject: [PATCH] feat: MetricKit TestVersion 1 (#2476)

This PR adds a first iteration of sending MetricKitData of MXCrashDiagnostic, MXCPUExceptionDiagnostic, and MXDiskWriteExceptionDiagnostic to Sentry. This PRs aim is to have the code running in the iOS-Swift test app via TestFlight to get some real MetricKit data of MXCPUExceptionDiagnostic, and MXDiskWriteExceptionDiagnostic.

MXCrashDiagnostic exists solely for validating the stacktrace symbolication.
---
 .../iOS-Swift.xcodeproj/project.pbxproj       |   6 +
 Samples/iOS-Swift/iOS-Swift/AppDelegate.swift |   3 +
 .../iOS-Swift/Base.lproj/Main.storyboard      |  32 +-
 .../iOS-Swift/Tools/DiskWriteException.swift  |  75 ++
 .../iOS-Swift/iOS-Swift/ViewController.swift  |  35 +-
 .../macOS-Swift.xcodeproj/project.pbxproj     |  15 +
 Sentry.xcodeproj/project.pbxproj              |  48 +
 Sources/Sentry/Public/SentryDefines.h         |   6 +
 Sources/Sentry/Public/SentryOptions.h         |  13 +
 Sources/Sentry/SentryBaseIntegration.m        |   9 +
 Sources/Sentry/SentryDependencyContainer.m    |  18 +
 Sources/Sentry/SentryMetricKitIntegration.m   | 190 ++++
 Sources/Sentry/SentryOptions.m                |  34 +-
 .../Sentry/include/SentryBaseIntegration.h    |   1 +
 .../include/SentryDependencyContainer.h       |   7 +-
 .../include/SentryMetricKitIntegration.h      |  19 +
 .../MetricKit/SentryMXCallStackTree.swift     |  62 ++
 Sources/Swift/MetricKit/SentryMXManager.swift |  72 ++
 .../metric-kit-callstack-tree-garbage.json    |  23 +
 .../metric-kit-callstack-tree-real.json       | 881 ++++++++++++++++++
 .../metric-kit-callstack-tree-simple.json     |  26 +
 ...ric-kit-callstack-tree-unknown-fields.json |  27 +
 .../SentryMXCallStackTreeTests.swift          |  76 ++
 .../SentryMetricKitIntegrationTests.swift     | 144 +++
 .../SentryNSURLSessionTaskSearchTests.swift   |   2 +-
 Tests/SentryTests/SentryOptionsTest.m         |   6 +
 .../SentryTests/SentryTests-Bridging-Header.h |   1 +
 .../TestUtils/TestExtensions.swift            |   8 +
 28 files changed, 1817 insertions(+), 22 deletions(-)
 create mode 100644 Samples/iOS-Swift/iOS-Swift/Tools/DiskWriteException.swift
 create mode 100644 Sources/Sentry/SentryMetricKitIntegration.m
 create mode 100644 Sources/Sentry/include/SentryMetricKitIntegration.h
 create mode 100644 Sources/Swift/MetricKit/SentryMXCallStackTree.swift
 create mode 100644 Sources/Swift/MetricKit/SentryMXManager.swift
 create mode 100644 Tests/Resources/metric-kit-callstack-tree-garbage.json
 create mode 100644 Tests/Resources/metric-kit-callstack-tree-real.json
 create mode 100644 Tests/Resources/metric-kit-callstack-tree-simple.json
 create mode 100644 Tests/Resources/metric-kit-callstack-tree-unknown-fields.json
 create mode 100644 Tests/SentryTests/Integrations/MetricKit/SentryMXCallStackTreeTests.swift
 create mode 100644 Tests/SentryTests/Integrations/MetricKit/SentryMetricKitIntegrationTests.swift

diff --git a/Samples/iOS-Swift/iOS-Swift.xcodeproj/project.pbxproj b/Samples/iOS-Swift/iOS-Swift.xcodeproj/project.pbxproj
index c1c94c626d..7f48d85272 100644
--- a/Samples/iOS-Swift/iOS-Swift.xcodeproj/project.pbxproj
+++ b/Samples/iOS-Swift/iOS-Swift.xcodeproj/project.pbxproj
@@ -16,6 +16,8 @@
 		637AFDB3243B02770034958B /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 637AFDB2243B02770034958B /* Assets.xcassets */; };
 		637AFDB6243B02770034958B /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 637AFDB4243B02770034958B /* LaunchScreen.storyboard */; };
 		7B3427F825876A5200056519 /* Tongariro.jpg in Resources */ = {isa = PBXBuildFile; fileRef = 7B3427F725876A5200056519 /* Tongariro.jpg */; };
+		7B5525B32938B5B5006A2932 /* DiskWriteException.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B5525B22938B5B5006A2932 /* DiskWriteException.swift */; };
+		7B5525B62938B644006A2932 /* DiskWriteException.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B5525B22938B5B5006A2932 /* DiskWriteException.swift */; };
 		7B64386B26A6C544000D0F65 /* LaunchUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B64386A26A6C544000D0F65 /* LaunchUITests.swift */; };
 		7B79000429028C7300A7F467 /* MetricKitManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B79000329028C7300A7F467 /* MetricKitManager.swift */; };
 		7BFC8B0626D4D24B000D3504 /* LoremIpsum.txt in Resources */ = {isa = PBXBuildFile; fileRef = 7BFC8B0526D4D24B000D3504 /* LoremIpsum.txt */; };
@@ -245,6 +247,7 @@
 		7B3427F725876A5200056519 /* Tongariro.jpg */ = {isa = PBXFileReference; lastKnownFileType = image.jpeg; path = Tongariro.jpg; sourceTree = "<group>"; };
 		7B4F33F7271EBD2500C8591E /* SwiftUI.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SwiftUI.swift; sourceTree = "<group>"; };
 		7B4F33FA271EBE0C00C8591E /* SwiftUIViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SwiftUIViewController.swift; sourceTree = "<group>"; };
+		7B5525B22938B5B5006A2932 /* DiskWriteException.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DiskWriteException.swift; sourceTree = "<group>"; };
 		7B64386826A6C544000D0F65 /* iOS-SwiftUITests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "iOS-SwiftUITests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
 		7B64386A26A6C544000D0F65 /* LaunchUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LaunchUITests.swift; sourceTree = "<group>"; };
 		7B64386C26A6C544000D0F65 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@@ -511,6 +514,7 @@
 				D8D7BB492750067900044146 /* UIAssert.swift */,
 				D8D7BB4D27501B9400044146 /* SpanObserver.swift */,
 				84FB812C2840021B00F3A94A /* iOS-Swift-Bridging-Header.h */,
+				7B5525B22938B5B5006A2932 /* DiskWriteException.swift */,
 			);
 			path = Tools;
 			sourceTree = "<group>";
@@ -809,6 +813,7 @@
 				D8444E4C275E38090042F4DE /* UIViewControllerExtension.swift in Sources */,
 				637AFDAE243B02760034958B /* ViewController.swift in Sources */,
 				0AABE2EA28855FF80057ED69 /* PermissionsViewController.swift in Sources */,
+				7B5525B32938B5B5006A2932 /* DiskWriteException.swift in Sources */,
 				84FB8120283EEDB900F3A94A /* PerformanceViewController.swift in Sources */,
 				D8F3D062274EBD4800B56F8C /* SpanExtension.swift in Sources */,
 				637AFDAA243B02760034958B /* AppDelegate.swift in Sources */,
@@ -858,6 +863,7 @@
 				D8269A4F274C09A400BD5BD5 /* SwiftUI.swift in Sources */,
 				D8444E57275F795D0042F4DE /* UIViewControllerExtension.swift in Sources */,
 				D8F3D058274E57D600B56F8C /* TableViewController.swift in Sources */,
+				7B5525B62938B644006A2932 /* DiskWriteException.swift in Sources */,
 				D8269A58274C0FC700BD5BD5 /* ViewController.swift in Sources */,
 				844DA821282584C300E6B62E /* CoreDataViewController.swift in Sources */,
 				D8444E55275F79570042F4DE /* SpanExtension.swift in Sources */,
diff --git a/Samples/iOS-Swift/iOS-Swift/AppDelegate.swift b/Samples/iOS-Swift/iOS-Swift/AppDelegate.swift
index eb0d35b200..a75b8981e0 100644
--- a/Samples/iOS-Swift/iOS-Swift/AppDelegate.swift
+++ b/Samples/iOS-Swift/iOS-Swift/AppDelegate.swift
@@ -19,6 +19,9 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
                 return event
             }
             options.debug = true
+            if #available(iOS 14.0, *) {
+                options.enableMetricKit = true
+            }
             // Sampling 100% - In Production you probably want to adjust this
             options.tracesSampleRate = 1.0
             options.sessionTrackingIntervalMillis = 5_000
diff --git a/Samples/iOS-Swift/iOS-Swift/Base.lproj/Main.storyboard b/Samples/iOS-Swift/iOS-Swift/Base.lproj/Main.storyboard
index f835a85963..c5caddff8b 100644
--- a/Samples/iOS-Swift/iOS-Swift/Base.lproj/Main.storyboard
+++ b/Samples/iOS-Swift/iOS-Swift/Base.lproj/Main.storyboard
@@ -18,13 +18,13 @@
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <stackView opaque="NO" contentMode="scaleAspectFit" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="480-5y-FtF">
-                                <rect key="frame" x="8" y="199.5" width="398" height="555.5"/>
+                                <rect key="frame" x="8" y="169.5" width="398" height="615.5"/>
                                 <subviews>
                                     <stackView opaque="NO" contentMode="scaleToFill" distribution="fillProportionally" alignment="top" translatesAutoresizingMaskIntoConstraints="NO" id="VbH-LD-DBn">
-                                        <rect key="frame" x="0.0" y="0.0" width="398" height="390"/>
+                                        <rect key="frame" x="0.0" y="0.0" width="398" height="450"/>
                                         <subviews>
                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillEqually" translatesAutoresizingMaskIntoConstraints="NO" id="hHG-as-TfH">
-                                                <rect key="frame" x="0.0" y="0.0" width="181.5" height="390"/>
+                                                <rect key="frame" x="0.0" y="0.0" width="181.5" height="450"/>
                                                 <subviews>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="QJW-l9-sD6">
                                                         <rect key="frame" x="0.0" y="0.0" width="181.5" height="30"/>
@@ -91,29 +91,43 @@
                                                             <action selector="oomCrash:" destination="BYZ-38-t0r" eventType="touchUpInside" id="Oju-om-O6e"/>
                                                         </connections>
                                                     </button>
-                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="xur-X2-ih4">
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="2dB-TW-SJY" userLabel="DiskWriteException">
                                                         <rect key="frame" x="0.0" y="270" width="181.5" height="30"/>
+                                                        <state key="normal" title="DiskWriteException"/>
+                                                        <connections>
+                                                            <action selector="diskWriteException:" destination="BYZ-38-t0r" eventType="touchUpInside" id="BG9-QM-rT0"/>
+                                                        </connections>
+                                                    </button>
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Nlv-4f-prb" userLabel="HighCpuLoad">
+                                                        <rect key="frame" x="0.0" y="300" width="181.5" height="30"/>
+                                                        <state key="normal" title="HighCpuLoad"/>
+                                                        <connections>
+                                                            <action selector="highCPULoad:" destination="BYZ-38-t0r" eventType="touchUpInside" id="hfR-s0-SRc"/>
+                                                        </connections>
+                                                    </button>
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="xur-X2-ih4">
+                                                        <rect key="frame" x="0.0" y="330" width="181.5" height="30"/>
                                                         <state key="normal" title="async crash"/>
                                                         <connections>
                                                             <action selector="asyncCrash:" destination="BYZ-38-t0r" eventType="touchUpInside" id="Mqi-sE-R7d"/>
                                                         </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="zmN-BT-tg3">
-                                                        <rect key="frame" x="0.0" y="300" width="181.5" height="30"/>
+                                                        <rect key="frame" x="0.0" y="360" width="181.5" height="30"/>
                                                         <state key="normal" title="permissions"/>
                                                         <connections>
                                                             <action selector="permissions:" destination="BYZ-38-t0r" eventType="touchUpInside" id="65U-z2-FjW"/>
                                                         </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="689-IN-jTP">
-                                                        <rect key="frame" x="0.0" y="330" width="181.5" height="30"/>
+                                                        <rect key="frame" x="0.0" y="390" width="181.5" height="30"/>
                                                         <state key="normal" title="Close"/>
                                                         <connections>
                                                             <action selector="close:" destination="BYZ-38-t0r" eventType="touchUpInside" id="P48-2Y-SKT"/>
                                                         </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="QIi-IM-YSk">
-                                                        <rect key="frame" x="0.0" y="360" width="181.5" height="30"/>
+                                                        <rect key="frame" x="0.0" y="420" width="181.5" height="30"/>
                                                         <state key="normal" title="Start SDK"/>
                                                         <connections>
                                                             <action selector="startSDK:" destination="BYZ-38-t0r" eventType="touchUpInside" id="UoF-Pv-fKg"/>
@@ -222,7 +236,7 @@
                                         </subviews>
                                     </stackView>
                                     <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="UrL-kT-AJU">
-                                        <rect key="frame" x="0.0" y="390" width="398" height="165.5"/>
+                                        <rect key="frame" x="0.0" y="450" width="398" height="165.5"/>
                                         <subviews>
                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="DSN  " textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="m3h-wb-Xfa">
                                                 <rect key="frame" x="8" y="32" width="382" height="20.5"/>
@@ -417,7 +431,7 @@
                                 </items>
                             </navigationBar>
                             <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" fixedFrame="YES" preservesSuperviewLayoutMargins="YES" layoutMarginsFollowReadableWidth="YES" delaysContentTouches="NO" editable="NO" adjustsFontForContentSizeCategory="YES" translatesAutoresizingMaskIntoConstraints="NO" id="sla-j3-cfX">
-                                <rect key="frame" x="19" y="69" width="373" height="825"/>
+                                <rect key="frame" x="18" y="70" width="374" height="824"/>
                                 <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                 <color key="backgroundColor" systemColor="systemBackgroundColor"/>
                                 <color key="textColor" systemColor="labelColor"/>
diff --git a/Samples/iOS-Swift/iOS-Swift/Tools/DiskWriteException.swift b/Samples/iOS-Swift/iOS-Swift/Tools/DiskWriteException.swift
new file mode 100644
index 0000000000..2d9f91599d
--- /dev/null
+++ b/Samples/iOS-Swift/iOS-Swift/Tools/DiskWriteException.swift
@@ -0,0 +1,75 @@
+import Foundation
+import Sentry
+
+/**
+ * The system throws an exception and generates a report when the disk writes from your app exceed a certain threshold in a 24-hour period.
+ * See https://developer.apple.com/documentation/xcode/reducing-disk-write.
+ * Therefore we write plenty of data to disk on a background thread to hopefully trigger a DiskWriteException.
+ */
+class DiskWriteException {
+    
+    private let dispatchQueue = DispatchQueue(label: "DiskWriteException", attributes: [.concurrent])
+    private let folder: URL
+    private var running = false
+    
+    init() {
+        // swiftlint:disable force_unwrapping
+        let cachesDirectory = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!
+        // swiftlint:enable force_unwrapping
+        folder = cachesDirectory.appendingPathComponent("DiskWriteException/")
+    }
+    
+    func continuouslyWriteToDisk() {
+        if running {
+            return
+        }
+        
+        running = true
+        
+        dispatchQueue.async {
+            do {
+                let fileManager = FileManager.default
+                try fileManager.createDirectory(at: self.folder, withIntermediateDirectories: true)
+                
+                let url = self.folder.appendingPathComponent("SomeBytes.txt")
+                fileManager.createFile(atPath: url.absoluteString, contents: nil)
+                
+                // Keep writing random data to SomeBytes.txt
+                while true {
+                    var data = Data()
+                    for _ in 0..<100_000 {
+                        let random = UInt8.random(in: 0...10)
+                        data.append(Data(repeating: random, count: 50))
+                    }
+                    
+                    try data.write(to: url, options: .atomic)
+                    self.delay()
+                }
+            } catch {
+                SentrySDK.capture(error: error)
+            }
+        }
+    }
+    
+    private func delay(timeout: Double = 0.1) {
+        let group = DispatchGroup()
+        group.enter()
+        
+        self.dispatchQueue.asyncAfter(deadline: .now() + timeout) {
+            group.leave()
+        }
+        
+        group.wait()
+    }
+    
+    func deleteFiles() {
+        let fileManager = FileManager.default
+        do {
+            if fileManager.fileExists(atPath: folder.path) {
+                try fileManager.removeItem(at: folder)
+            }
+        } catch {
+            SentrySDK.capture(error: error)
+        }
+    }
+}
diff --git a/Samples/iOS-Swift/iOS-Swift/ViewController.swift b/Samples/iOS-Swift/iOS-Swift/ViewController.swift
index 2c9f13af7c..c57034c744 100644
--- a/Samples/iOS-Swift/iOS-Swift/ViewController.swift
+++ b/Samples/iOS-Swift/iOS-Swift/ViewController.swift
@@ -9,7 +9,8 @@ class ViewController: UIViewController {
     @IBOutlet weak var framesLabel: UILabel!
     @IBOutlet weak var breadcrumbLabel: UILabel!
     
-    private let dispatchQueue = DispatchQueue(label: "ViewController")
+    private let dispatchQueue = DispatchQueue(label: "ViewController", attributes: .concurrent)
+    private let diskWriteException = DiskWriteException()
 
     override func viewDidLoad() {
         super.viewDidLoad()
@@ -200,6 +201,38 @@ class ViewController: UIViewController {
             }
         }
     }
+    
+    @IBAction func diskWriteException(_ sender: Any) {
+        diskWriteException.continuouslyWriteToDisk()
+        
+        // As we are writing to disk continuously we would keep adding spans to this UIEventTransaction.
+        SentrySDK.span?.finish()
+    }
+    
+    @IBAction func highCPULoad(_ sender: Any) {
+        dispatchQueue.async {
+            while true {
+                _ = self.calcPi()
+            }
+        }
+    }
+    
+    private func calcPi() -> Double {
+        var denominator = 1.0
+        var pi = 0.0
+     
+        for i in 0..<10_000_000 {
+            if i % 2 == 0 {
+                pi += 4 / denominator
+            } else {
+                pi -= 4 / denominator
+            }
+            
+            denominator += 2
+        }
+        
+        return pi
+    }
 
     @IBAction func anrFullyBlocking(_ sender: Any) {
         let buttonTitle = self.anrFullyBlockingButton.currentTitle
diff --git a/Samples/macOS-Swift/macOS-Swift.xcodeproj/project.pbxproj b/Samples/macOS-Swift/macOS-Swift.xcodeproj/project.pbxproj
index a71f6d33df..39bf6e4580 100644
--- a/Samples/macOS-Swift/macOS-Swift.xcodeproj/project.pbxproj
+++ b/Samples/macOS-Swift/macOS-Swift.xcodeproj/project.pbxproj
@@ -40,6 +40,13 @@
 			remoteGlobalIDString = 63AA759A1EB8AEF500D153DE;
 			remoteInfo = Sentry;
 		};
+		7B0AC1772939FBC700EFD958 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 6308533E2440C45A00DDE4CE /* Sentry.xcodeproj */;
+			proxyType = 2;
+			remoteGlobalIDString = D81A3488291D0AC0005A27A9;
+			remoteInfo = SentryPrivate;
+		};
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -91,6 +98,7 @@
 			children = (
 				630853442440C45A00DDE4CE /* Sentry.framework */,
 				630853462440C45A00DDE4CE /* SentryTests.xctest */,
+				7B0AC1782939FBC700EFD958 /* SentryPrivate.framework */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -217,6 +225,13 @@
 			remoteRef = 630853452440C45A00DDE4CE /* PBXContainerItemProxy */;
 			sourceTree = BUILT_PRODUCTS_DIR;
 		};
+		7B0AC1782939FBC700EFD958 /* SentryPrivate.framework */ = {
+			isa = PBXReferenceProxy;
+			fileType = wrapper.framework;
+			path = SentryPrivate.framework;
+			remoteRef = 7B0AC1772939FBC700EFD958 /* PBXContainerItemProxy */;
+			sourceTree = BUILT_PRODUCTS_DIR;
+		};
 /* End PBXReferenceProxy section */
 
 /* Begin PBXResourcesBuildPhase section */
diff --git a/Sentry.xcodeproj/project.pbxproj b/Sentry.xcodeproj/project.pbxproj
index 1bb1b09f0e..a618258c25 100644
--- a/Sentry.xcodeproj/project.pbxproj
+++ b/Sentry.xcodeproj/project.pbxproj
@@ -291,6 +291,8 @@
 		7B04A9AB24EA5F8D00E710B1 /* SentryUserTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B04A9AA24EA5F8D00E710B1 /* SentryUserTests.swift */; };
 		7B04A9AF24EAC02C00E710B1 /* SentryRetryAfterHeaderParser.h in Headers */ = {isa = PBXBuildFile; fileRef = 7BBD189C244EC71A00427C76 /* SentryRetryAfterHeaderParser.h */; };
 		7B05A61824A4D14A00EF211D /* SentrySessionGeneratorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B05A61724A4D14A00EF211D /* SentrySessionGeneratorTests.swift */; };
+		7B08A3452924CF6C0059603A /* SentryMetricKitIntegration.h in Headers */ = {isa = PBXBuildFile; fileRef = 7B08A3442924CF6C0059603A /* SentryMetricKitIntegration.h */; };
+		7B08A3472924CF9C0059603A /* SentryMetricKitIntegration.m in Sources */ = {isa = PBXBuildFile; fileRef = 7B08A3462924CF9C0059603A /* SentryMetricKitIntegration.m */; };
 		7B0A54222521C21E00A71716 /* SentryFrameRemover.h in Headers */ = {isa = PBXBuildFile; fileRef = 7B0A54212521C21E00A71716 /* SentryFrameRemover.h */; };
 		7B0A54282521C22C00A71716 /* SentryFrameRemover.m in Sources */ = {isa = PBXBuildFile; fileRef = 7B0A54272521C22C00A71716 /* SentryFrameRemover.m */; };
 		7B0A542E2521C62400A71716 /* SentryFrameRemoverTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B0A542D2521C62400A71716 /* SentryFrameRemoverTests.swift */; };
@@ -531,6 +533,7 @@
 		7BD86ECD264A78A6005439DB /* SentryAppStartTrackerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BD86ECC264A78A6005439DB /* SentryAppStartTrackerTests.swift */; };
 		7BD86ECF264A7C77005439DB /* SentryAppStartMeasurement.h in Headers */ = {isa = PBXBuildFile; fileRef = 7BD86ECE264A7C77005439DB /* SentryAppStartMeasurement.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		7BD86ED1264A7CF6005439DB /* SentryAppStartMeasurement.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BD86ED0264A7CF6005439DB /* SentryAppStartMeasurement.m */; };
+		7BD9509F2924E3E1009EA8EB /* SentryMXManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BD9509E2924E3E1009EA8EB /* SentryMXManager.swift */; };
 		7BDB03B7251364F800BAE198 /* SentryDispatchQueueWrapper.h in Headers */ = {isa = PBXBuildFile; fileRef = 7BDB03B6251364F800BAE198 /* SentryDispatchQueueWrapper.h */; };
 		7BDB03BB2513652900BAE198 /* SentryDispatchQueueWrapper.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BDB03BA2513652900BAE198 /* SentryDispatchQueueWrapper.m */; };
 		7BDB03BF25136A7D00BAE198 /* TestSentryDispatchQueueWrapper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BDB03BE25136A7D00BAE198 /* TestSentryDispatchQueueWrapper.swift */; };
@@ -565,6 +568,9 @@
 		7BF1F6AE282A4FE2006BD6AB /* SentryTestObserver.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BF1F6AD282A4FE2006BD6AB /* SentryTestObserver.m */; };
 		7BF536D124BDF3E7004FA6A2 /* SentryEnvelopeTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF536D024BDF3E7004FA6A2 /* SentryEnvelopeTests.swift */; };
 		7BF536D424BEF255004FA6A2 /* SentryAssertions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF536D324BEF255004FA6A2 /* SentryAssertions.swift */; };
+		7BF6505F292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF6505E292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift */; };
+		7BF65062292B8F1C00BBA5A8 /* SentryMXCallStackTree.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF65061292B8F1C00BBA5A8 /* SentryMXCallStackTree.swift */; };
+		7BF65064292B905A00BBA5A8 /* SentryMXCallStackTreeTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BF65063292B905A00BBA5A8 /* SentryMXCallStackTreeTests.swift */; };
 		7BF9EF722722A84800B5BBEF /* SentryClassRegistrator.h in Headers */ = {isa = PBXBuildFile; fileRef = 7BF9EF712722A84800B5BBEF /* SentryClassRegistrator.h */; };
 		7BF9EF742722A85B00B5BBEF /* SentryClassRegistrator.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BF9EF732722A85B00B5BBEF /* SentryClassRegistrator.m */; };
 		7BF9EF762722B34700B5BBEF /* SentrySubClassFinder.h in Headers */ = {isa = PBXBuildFile; fileRef = 7BF9EF752722B34700B5BBEF /* SentrySubClassFinder.h */; };
@@ -1051,6 +1057,8 @@
 		7B01CE3C271993AB00B5AF31 /* SentryTransportFactoryTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryTransportFactoryTests.swift; sourceTree = "<group>"; };
 		7B04A9AA24EA5F8D00E710B1 /* SentryUserTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryUserTests.swift; sourceTree = "<group>"; };
 		7B05A61724A4D14A00EF211D /* SentrySessionGeneratorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentrySessionGeneratorTests.swift; sourceTree = "<group>"; };
+		7B08A3442924CF6C0059603A /* SentryMetricKitIntegration.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = SentryMetricKitIntegration.h; path = include/SentryMetricKitIntegration.h; sourceTree = "<group>"; };
+		7B08A3462924CF9C0059603A /* SentryMetricKitIntegration.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryMetricKitIntegration.m; sourceTree = "<group>"; };
 		7B0A54212521C21E00A71716 /* SentryFrameRemover.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = SentryFrameRemover.h; path = include/SentryFrameRemover.h; sourceTree = "<group>"; };
 		7B0A54272521C22C00A71716 /* SentryFrameRemover.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryFrameRemover.m; sourceTree = "<group>"; };
 		7B0A542D2521C62400A71716 /* SentryFrameRemoverTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryFrameRemoverTests.swift; sourceTree = "<group>"; };
@@ -1308,6 +1316,7 @@
 		7BD86ECC264A78A6005439DB /* SentryAppStartTrackerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryAppStartTrackerTests.swift; sourceTree = "<group>"; };
 		7BD86ECE264A7C77005439DB /* SentryAppStartMeasurement.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = SentryAppStartMeasurement.h; path = include/HybridPublic/SentryAppStartMeasurement.h; sourceTree = "<group>"; };
 		7BD86ED0264A7CF6005439DB /* SentryAppStartMeasurement.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryAppStartMeasurement.m; sourceTree = "<group>"; };
+		7BD9509E2924E3E1009EA8EB /* SentryMXManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryMXManager.swift; sourceTree = "<group>"; };
 		7BDB03B6251364F800BAE198 /* SentryDispatchQueueWrapper.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = SentryDispatchQueueWrapper.h; path = include/SentryDispatchQueueWrapper.h; sourceTree = "<group>"; };
 		7BDB03BA2513652900BAE198 /* SentryDispatchQueueWrapper.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryDispatchQueueWrapper.m; sourceTree = "<group>"; };
 		7BDB03BE25136A7D00BAE198 /* TestSentryDispatchQueueWrapper.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestSentryDispatchQueueWrapper.swift; sourceTree = "<group>"; };
@@ -1348,6 +1357,9 @@
 		7BF1F6AD282A4FE2006BD6AB /* SentryTestObserver.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryTestObserver.m; sourceTree = "<group>"; };
 		7BF536D024BDF3E7004FA6A2 /* SentryEnvelopeTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryEnvelopeTests.swift; sourceTree = "<group>"; };
 		7BF536D324BEF255004FA6A2 /* SentryAssertions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryAssertions.swift; sourceTree = "<group>"; };
+		7BF6505E292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryMetricKitIntegrationTests.swift; sourceTree = "<group>"; };
+		7BF65061292B8F1C00BBA5A8 /* SentryMXCallStackTree.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryMXCallStackTree.swift; sourceTree = "<group>"; };
+		7BF65063292B905A00BBA5A8 /* SentryMXCallStackTreeTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SentryMXCallStackTreeTests.swift; sourceTree = "<group>"; };
 		7BF9EF712722A84800B5BBEF /* SentryClassRegistrator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SentryClassRegistrator.h; sourceTree = "<group>"; };
 		7BF9EF732722A85B00B5BBEF /* SentryClassRegistrator.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SentryClassRegistrator.m; sourceTree = "<group>"; };
 		7BF9EF752722B34700B5BBEF /* SentrySubClassFinder.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SentrySubClassFinder.h; sourceTree = "<group>"; };
@@ -1845,6 +1857,7 @@
 		6383953423ABA269000C1594 /* Integrations */ = {
 			isa = PBXGroup;
 			children = (
+				7B08A3432924CF4E0059603A /* MetricKit */,
 				7B127B0B27CF6EF600A71ED2 /* ANR */,
 				7BE0DC33272AE74A004FA8B7 /* Breadcrumbs */,
 				7BE0DC34272AE78C004FA8B7 /* OutOfMemory */,
@@ -2290,6 +2303,15 @@
 			path = SentryCrash;
 			sourceTree = "<group>";
 		};
+		7B08A3432924CF4E0059603A /* MetricKit */ = {
+			isa = PBXGroup;
+			children = (
+				7B08A3442924CF6C0059603A /* SentryMetricKitIntegration.h */,
+				7B08A3462924CF9C0059603A /* SentryMetricKitIntegration.m */,
+			);
+			name = MetricKit;
+			sourceTree = "<group>";
+		};
 		7B127B0B27CF6EF600A71ED2 /* ANR */ = {
 			isa = PBXGroup;
 			children = (
@@ -2401,6 +2423,7 @@
 		7B944FA924697E9700A10721 /* Integrations */ = {
 			isa = PBXGroup;
 			children = (
+				7BF6505D292B77D100BBA5A8 /* MetricKit */,
 				D808FB85281AB2EF009A2A33 /* UIEvents */,
 				D8AB40D92806EBDC00E5E9F7 /* Screenshot */,
 				0A9BF4E528A123070068D266 /* ViewHierarchy */,
@@ -2775,6 +2798,24 @@
 			path = TestUtils;
 			sourceTree = "<group>";
 		};
+		7BF6505D292B77D100BBA5A8 /* MetricKit */ = {
+			isa = PBXGroup;
+			children = (
+				7BF6505E292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift */,
+				7BF65063292B905A00BBA5A8 /* SentryMXCallStackTreeTests.swift */,
+			);
+			path = MetricKit;
+			sourceTree = "<group>";
+		};
+		7BF65060292B8EFE00BBA5A8 /* MetricKit */ = {
+			isa = PBXGroup;
+			children = (
+				7BD9509E2924E3E1009EA8EB /* SentryMXManager.swift */,
+				7BF65061292B8F1C00BBA5A8 /* SentryMXCallStackTree.swift */,
+			);
+			path = MetricKit;
+			sourceTree = "<group>";
+		};
 		7D826E3C2390840E00EED93D /* Utils */ = {
 			isa = PBXGroup;
 			children = (
@@ -2896,6 +2937,7 @@
 		D800942328F82E8D005D3943 /* Swift */ = {
 			isa = PBXGroup;
 			children = (
+				7BF65060292B8EFE00BBA5A8 /* MetricKit */,
 				D81A349B291D0C0B005A27A9 /* Sentry.swift */,
 				D800942628F82F3A005D3943 /* SwiftDescriptor.swift */,
 			);
@@ -3019,6 +3061,7 @@
 				7B6C5F8126034354007F7DFF /* SentryOutOfMemoryLogic.h in Headers */,
 				63FE708520DA4C1000CDBAE8 /* SentryCrashReportFilter.h in Headers */,
 				D8ACE3CD2762187D00F5A213 /* SentryNSDataSwizzling.h in Headers */,
+				7B08A3452924CF6C0059603A /* SentryMetricKitIntegration.h in Headers */,
 				0A2D8DA8289BC905008720F6 /* SentryViewHierarchy.h in Headers */,
 				8EAE980C261E9F530073B6B3 /* SentryUIViewControllerPerformanceTracker.h in Headers */,
 				63FE717D20DA4C1100CDBAE8 /* SentryCrashCachedData.h in Headers */,
@@ -3438,6 +3481,7 @@
 				03F84D3727DD4191008FE43F /* SentrySamplingProfiler.cpp in Sources */,
 				8453421628BE8A9500C22EEC /* SentrySpanStatus.m in Sources */,
 				7B9657262683104C00C66E25 /* NSData+Sentry.m in Sources */,
+				7B08A3472924CF9C0059603A /* SentryMetricKitIntegration.m in Sources */,
 				7B63459B280EB9E200CFA05A /* SentryUIEventTrackingIntegration.m in Sources */,
 				15E0A8ED240F2CB000F044E3 /* SentrySerialization.m in Sources */,
 				7BC85235245880AE005A70F0 /* SentryDataCategoryMapper.m in Sources */,
@@ -3633,6 +3677,7 @@
 			files = (
 				8ED3D306264DFE700049393B /* SentryUIViewControllerSanitizerTests.swift in Sources */,
 				7BFC16AD2524BCE700FF6266 /* SentryMessageTests.swift in Sources */,
+				7BF6505F292B77EC00BBA5A8 /* SentryMetricKitIntegrationTests.swift in Sources */,
 				7BA61CC6247CFC5F00C130A8 /* SentryCrashDefaultBinaryImageProviderTests.swift in Sources */,
 				7BBC827925DFD7D7005F1ED8 /* SentryInAppLogicTests.swift in Sources */,
 				7BD7299A2463EA4A00EA3610 /* SentryDateUtilTests.swift in Sources */,
@@ -3649,6 +3694,7 @@
 				7B30B68026527C3C006B2752 /* SentryFramesTrackerTests.swift in Sources */,
 				63FE720E20DA66EC00CDBAE8 /* SentryCrashCString_Tests.m in Sources */,
 				0A9BF4EB28A127120068D266 /* SentryViewHierarchyIntegrationTests.swift in Sources */,
+				7BF65064292B905A00BBA5A8 /* SentryMXCallStackTreeTests.swift in Sources */,
 				631501BB1EE6F30B00512C5B /* SentrySwizzleTests.m in Sources */,
 				15D0AC882459EE4D006541C2 /* SentryNSURLRequestTests.swift in Sources */,
 				7BE3C78724472E9800A38442 /* TestRequestManager.swift in Sources */,
@@ -3871,6 +3917,8 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				7BD9509F2924E3E1009EA8EB /* SentryMXManager.swift in Sources */,
+				7BF65062292B8F1C00BBA5A8 /* SentryMXCallStackTree.swift in Sources */,
 				D81A3491291D0AC8005A27A9 /* SwiftDescriptor.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/Sources/Sentry/Public/SentryDefines.h b/Sources/Sentry/Public/SentryDefines.h
index 48a7698048..6e1d16c4aa 100644
--- a/Sources/Sentry/Public/SentryDefines.h
+++ b/Sources/Sentry/Public/SentryDefines.h
@@ -18,6 +18,12 @@
 #    define SENTRY_HAS_UIKIT 0
 #endif
 
+#if TARGET_OS_IOS || TARGET_OS_OSX || TARGET_OS_MACCATALYST
+#    define SENTRY_HAS_METRIC_KIT 1
+#else
+#    define SENTRY_HAS_METRIC_KIT 0
+#endif
+
 #define SENTRY_NO_INIT                                                                             \
     -(instancetype)init NS_UNAVAILABLE;                                                            \
     +(instancetype) new NS_UNAVAILABLE;
diff --git a/Sources/Sentry/Public/SentryOptions.h b/Sources/Sentry/Public/SentryOptions.h
index ff8d85a953..7e3aef5b33 100644
--- a/Sources/Sentry/Public/SentryOptions.h
+++ b/Sources/Sentry/Public/SentryOptions.h
@@ -446,6 +446,19 @@ NS_SWIFT_NAME(Options)
  */
 @property (nonatomic, strong) NSArray *failedRequestTargets;
 
+#if SENTRY_HAS_METRIC_KIT
+
+/**
+ * ATTENTION: This is an experimental feature.
+ *
+ * This feature is disabled by default. When enabled, the SDK sends ``MXDiagnosticPayload`` data to
+ * Sentry.
+ */
+@property (nonatomic, assign) BOOL enableMetricKit API_AVAILABLE(
+    ios(14.0), macos(12.0), macCatalyst(14.0)) API_UNAVAILABLE(tvos, watchos);
+
+#endif
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/Sources/Sentry/SentryBaseIntegration.m b/Sources/Sentry/SentryBaseIntegration.m
index 53da9f16c4..30ee590dfe 100644
--- a/Sources/Sentry/SentryBaseIntegration.m
+++ b/Sources/Sentry/SentryBaseIntegration.m
@@ -146,6 +146,15 @@ - (BOOL)shouldBeEnabledWithOptions:(SentryOptions *)options
         return NO;
     }
 
+#if SENTRY_HAS_METRIC_KIT
+    if (@available(iOS 14.0, macOS 12.0, macCatalyst 14.0, *)) {
+        if ((integrationOptions & kIntegrationOptionEnableMetricKit) && !options.enableMetricKit) {
+            [self logWithOptionName:@"enableMetricKit"];
+            return NO;
+        }
+    }
+#endif
+
     return YES;
 }
 
diff --git a/Sources/Sentry/SentryDependencyContainer.m b/Sources/Sentry/SentryDependencyContainer.m
index 1cf121063f..bc3ea2ffec 100644
--- a/Sources/Sentry/SentryDependencyContainer.m
+++ b/Sources/Sentry/SentryDependencyContainer.m
@@ -13,6 +13,7 @@
 #import <SentryNSNotificationCenterWrapper.h>
 #import <SentrySDK+Private.h>
 #import <SentryScreenshot.h>
+#import <SentrySwift.h>
 #import <SentrySwizzleWrapper.h>
 #import <SentrySysctl.h>
 #import <SentryThreadWrapper.h>
@@ -208,7 +209,24 @@ - (SentryANRTracker *)getANRTracker:(NSTimeInterval)timeout
             }
         }
     }
+
     return _anrTracker;
 }
 
+#if SENTRY_HAS_METRIC_KIT
+- (SentryMXManager *)metricKitManager
+{
+    if (_metricKitManager == nil) {
+        @synchronized(sentryDependencyContainerLock) {
+            if (_metricKitManager == nil) {
+                _metricKitManager = [[SentryMXManager alloc] init];
+            }
+        }
+    }
+
+    return _metricKitManager;
+}
+
+#endif
+
 @end
diff --git a/Sources/Sentry/SentryMetricKitIntegration.m b/Sources/Sentry/SentryMetricKitIntegration.m
new file mode 100644
index 0000000000..005ac51dd0
--- /dev/null
+++ b/Sources/Sentry/SentryMetricKitIntegration.m
@@ -0,0 +1,190 @@
+#import "SentryScope.h"
+#import <Foundation/Foundation.h>
+#import <SentryDependencyContainer.h>
+#import <SentryEvent.h>
+#import <SentryException.h>
+#import <SentryFrame.h>
+#import <SentryHexAddressFormatter.h>
+#import <SentryMechanism.h>
+#import <SentryMetricKitIntegration.h>
+#import <SentrySDK+Private.h>
+#import <SentryStacktrace.h>
+#import <SentryThread.h>
+
+#if SENTRY_HAS_METRIC_KIT
+
+/**
+ * We need to check if MetricKit is available for compatibility on iOS 12 and below. As there are no
+ * compiler directives for iOS versions we use __has_include.
+ */
+#    if __has_include(<MetricKit/MetricKit.h>)
+#        import <MetricKit/MetricKit.h>
+#    endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface
+SentryMetricKitIntegration ()
+
+@property (nonatomic, strong, nullable) SentryMXManager *metricKitManager;
+@property (nonatomic, strong) NSMeasurementFormatter *measurementFormatter;
+
+@end
+
+@implementation SentryMetricKitIntegration
+
+- (BOOL)installWithOptions:(SentryOptions *)options
+{
+    if (![super installWithOptions:options]) {
+        return NO;
+    }
+
+    self.metricKitManager = [SentryDependencyContainer sharedInstance].metricKitManager;
+    self.metricKitManager.delegate = self;
+    [self.metricKitManager receiveReports];
+    self.measurementFormatter = [[NSMeasurementFormatter alloc] init];
+    self.measurementFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
+    self.measurementFormatter.unitOptions = NSMeasurementFormatterUnitOptionsProvidedUnit;
+
+    return YES;
+}
+
+- (SentryIntegrationOption)integrationOptions
+{
+    return kIntegrationOptionEnableMetricKit;
+}
+
+- (void)uninstall
+{
+    [self.metricKitManager pauseReports];
+    self.metricKitManager.delegate = nil;
+    self.metricKitManager = nil;
+}
+
+/**
+ * Only for testing. We need to publish the iOS-Swift sample app to TestFlight for properly testing
+ * this. We easily get MXCrashDiagnostic and so we can use them for validating symbolication. We
+ * don't plan on releasing this. Instead, we are going to remove this code before releasing.
+ */
+- (void)didReceiveCrashDiagnostic:(MXCrashDiagnostic *)diagnostic
+                    callStackTree:(SentryMXCallStackTree *)callStackTree
+                   timeStampBegin:(NSDate *)timeStampBegin
+                     timeStampEnd:(NSDate *)timeStampEnd
+{
+    NSString *exceptionValue =
+        [NSString stringWithFormat:@"MachException Type:%@ Code:%@ Signal:%@",
+                  diagnostic.exceptionType, diagnostic.exceptionCode, diagnostic.signal];
+
+    [self captureMXEvent:callStackTree
+          exceptionValue:exceptionValue
+           exceptionType:@"MXCrashDiagnostic"
+          withScopeBlock:^(SentryScope *_Nonnull scope) {
+              [scope clearBreadcrumbs];
+              if (diagnostic.virtualMemoryRegionInfo) {
+                  [scope setContextValue:@ {
+                      @"virtualMemoryRegionInfo" : diagnostic.virtualMemoryRegionInfo
+                  }
+                                  forKey:@"MetricKit"];
+              }
+          }];
+}
+
+- (void)didReceiveCpuExceptionDiagnostic:(MXCPUExceptionDiagnostic *)diagnostic
+                           callStackTree:(SentryMXCallStackTree *)callStackTree
+                          timeStampBegin:(NSDate *)timeStampBegin
+                            timeStampEnd:(NSDate *)timeStampEnd
+{
+    NSString *totalCPUTime =
+        [self.measurementFormatter stringFromMeasurement:diagnostic.totalCPUTime];
+    NSString *totalSampledTime =
+        [self.measurementFormatter stringFromMeasurement:diagnostic.totalSampledTime];
+
+    NSString *exceptionValue =
+        [NSString stringWithFormat:@"MXCPUException totalCPUTime:%@ totalSampledTime:%@",
+                  totalCPUTime, totalSampledTime];
+
+    // Still need to figure out proper exception values and types.
+    // This code is currently only there for testing with Testflight.
+    [self captureMXEvent:callStackTree
+          exceptionValue:exceptionValue
+           exceptionType:@"MXCPUException"
+          withScopeBlock:^(SentryScope *_Nonnull scope) { [scope clearBreadcrumbs]; }];
+}
+
+- (void)didReceiveDiskWriteExceptionDiagnostic:(MXDiskWriteExceptionDiagnostic *)diagnostic
+                                 callStackTree:(SentryMXCallStackTree *)callStackTree
+                                timeStampBegin:(NSDate *)timeStampBegin
+                                  timeStampEnd:(NSDate *)timeStampEnd
+{
+    NSString *totalWritesCaused =
+        [self.measurementFormatter stringFromMeasurement:diagnostic.totalWritesCaused];
+
+    NSString *exceptionValue =
+        [NSString stringWithFormat:@"MXDiskWriteException totalWritesCaused:%@", totalWritesCaused];
+
+    // Still need to figure out proper exception values and types.
+    // This code is currently only there for testing with Testflight.
+    [self captureMXEvent:callStackTree
+          exceptionValue:exceptionValue
+           exceptionType:@"MXDiskWriteException"
+          withScopeBlock:^(SentryScope *_Nonnull scope) { [scope clearBreadcrumbs]; }];
+}
+
+- (void)captureMXEvent:(SentryMXCallStackTree *)callStackTree
+        exceptionValue:(NSString *)exceptionValue
+         exceptionType:(NSString *)exceptionType
+        withScopeBlock:(void (^)(SentryScope *))block
+{
+    SentryEvent *event = [[SentryEvent alloc] initWithLevel:kSentryLevelFatal];
+
+    SentryException *exception = [[SentryException alloc] initWithValue:exceptionValue
+                                                                   type:exceptionType];
+    SentryMechanism *mechanism = [[SentryMechanism alloc] initWithType:exceptionType];
+    mechanism.handled = @(NO);
+    exception.mechanism = mechanism;
+    event.exceptions = @[ exception ];
+
+    event.threads = [self convertToSentryThreads:callStackTree.callStacks];
+
+    // The crash event can be way from the past. We don't want to impact the current session.
+    // Therefore we don't call captureCrashEvent.
+    [SentrySDK captureEvent:event withScopeBlock:block];
+}
+
+- (NSArray<SentryThread *> *)convertToSentryThreads:(NSArray<SentryMXCallStack *> *)callStacks
+{
+    NSUInteger i = 0;
+    NSMutableArray<SentryThread *> *threads = [NSMutableArray array];
+    for (SentryMXCallStack *callStack in callStacks) {
+
+        NSMutableArray<SentryFrame *> *frames = [NSMutableArray array];
+        for (SentryMXFrame *mxFrame in callStack.flattenedRootFrames) {
+
+            SentryFrame *frame = [[SentryFrame alloc] init];
+            frame.package = mxFrame.binaryName;
+            frame.instructionAddress = sentry_formatHexAddress(@(mxFrame.address));
+            NSNumber *imageAddress = @(mxFrame.address - mxFrame.offsetIntoBinaryTextSegment);
+            frame.imageAddress = sentry_formatHexAddress(imageAddress);
+
+            [frames addObject:frame];
+        }
+
+        SentryStacktrace *stacktrace = [[SentryStacktrace alloc] initWithFrames:frames
+                                                                      registers:@{}];
+
+        SentryThread *thread = [[SentryThread alloc] initWithThreadId:@(i)];
+        thread.stacktrace = stacktrace;
+
+        [threads addObject:thread];
+
+        i++;
+    }
+
+    return threads;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif
diff --git a/Sources/Sentry/SentryOptions.m b/Sources/Sentry/SentryOptions.m
index 86c47bad49..67aa695a7b 100644
--- a/Sources/Sentry/SentryOptions.m
+++ b/Sources/Sentry/SentryOptions.m
@@ -29,18 +29,26 @@ - (void)setMeasurement:(SentryMeasurementValue *)measurement
 
 + (NSArray<NSString *> *)defaultIntegrations
 {
-    return @[
-        @"SentryCrashIntegration",
+    NSMutableArray<NSString *> *defaultIntegrations =
+        @[
+            @"SentryCrashIntegration",
 #if SENTRY_HAS_UIKIT
-        @"SentryANRTrackingIntegration", @"SentryScreenshotIntegration",
-        @"SentryUIEventTrackingIntegration", @"SentryViewHierarchyIntegration",
+            @"SentryANRTrackingIntegration", @"SentryScreenshotIntegration",
+            @"SentryUIEventTrackingIntegration", @"SentryViewHierarchyIntegration",
 #endif
-        @"SentryFramesTrackingIntegration", @"SentryAutoBreadcrumbTrackingIntegration",
-        @"SentryAutoSessionTrackingIntegration", @"SentryAppStartTrackingIntegration",
-        @"SentryOutOfMemoryTrackingIntegration", @"SentryPerformanceTrackingIntegration",
-        @"SentryNetworkTrackingIntegration", @"SentryFileIOTrackingIntegration",
-        @"SentryCoreDataTrackingIntegration"
-    ];
+            @"SentryFramesTrackingIntegration", @"SentryAutoBreadcrumbTrackingIntegration",
+            @"SentryAutoSessionTrackingIntegration", @"SentryAppStartTrackingIntegration",
+            @"SentryOutOfMemoryTrackingIntegration", @"SentryPerformanceTrackingIntegration",
+            @"SentryNetworkTrackingIntegration", @"SentryFileIOTrackingIntegration",
+            @"SentryCoreDataTrackingIntegration"
+        ]
+            .mutableCopy;
+
+    if (@available(iOS 14.0, macCatalyst 14.0, macOS 12.0, *)) {
+        [defaultIntegrations addObject:@"SentryMetricKitIntegration"];
+    }
+
+    return defaultIntegrations;
 }
 
 - (instancetype)init
@@ -130,6 +138,12 @@ - (instancetype)init
         SentryHttpStatusCodeRange *defaultHttpStatusCodeRange =
             [[SentryHttpStatusCodeRange alloc] initWithMin:500 max:599];
         self.failedRequestStatusCodes = @[ defaultHttpStatusCodeRange ];
+
+#if SENTRY_HAS_METRIC_KIT
+        if (@available(iOS 14.0, macOS 12.0, macCatalyst 14.0, *)) {
+            self.enableMetricKit = NO;
+        }
+#endif
     }
     return self;
 }
diff --git a/Sources/Sentry/include/SentryBaseIntegration.h b/Sources/Sentry/include/SentryBaseIntegration.h
index 7d48972626..6f3dab3d85 100644
--- a/Sources/Sentry/include/SentryBaseIntegration.h
+++ b/Sources/Sentry/include/SentryBaseIntegration.h
@@ -22,6 +22,7 @@ typedef NS_OPTIONS(NSUInteger, SentryIntegrationOption) {
     kIntegrationOptionDebuggerNotAttached = 1 << 14,
     kIntegrationOptionAttachViewHierarchy = 1 << 15,
     kIntegrationOptionEnableCrashHandler = 1 << 16,
+    kIntegrationOptionEnableMetricKit = 1 << 17,
 };
 
 @interface SentryBaseIntegration : NSObject
diff --git a/Sources/Sentry/include/SentryDependencyContainer.h b/Sources/Sentry/include/SentryDependencyContainer.h
index 140f75e3de..054ddf9a72 100644
--- a/Sources/Sentry/include/SentryDependencyContainer.h
+++ b/Sources/Sentry/include/SentryDependencyContainer.h
@@ -4,7 +4,7 @@
 
 @class SentryAppStateManager, SentryCrashWrapper, SentryThreadWrapper, SentrySwizzleWrapper,
     SentryDispatchQueueWrapper, SentryDebugImageProvider, SentryANRTracker,
-    SentryNSNotificationCenterWrapper;
+    SentryNSNotificationCenterWrapper, SentryMXManager;
 
 #if SENTRY_HAS_UIKIT
 @class SentryScreenshot, SentryUIApplication, SentryViewHierarchy;
@@ -41,6 +41,11 @@ SENTRY_NO_INIT
 
 - (SentryANRTracker *)getANRTracker:(NSTimeInterval)timeout;
 
+#if SENTRY_HAS_METRIC_KIT
+@property (nonatomic, strong) SentryMXManager *metricKitManager API_AVAILABLE(
+    ios(14.0), macos(12.0)) API_UNAVAILABLE(tvos, watchos);
+#endif
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/Sources/Sentry/include/SentryMetricKitIntegration.h b/Sources/Sentry/include/SentryMetricKitIntegration.h
new file mode 100644
index 0000000000..c7f884ac60
--- /dev/null
+++ b/Sources/Sentry/include/SentryMetricKitIntegration.h
@@ -0,0 +1,19 @@
+#import "SentryBaseIntegration.h"
+#import "SentryIntegrationProtocol.h"
+#import "SentrySwift.h"
+#import <Foundation/Foundation.h>
+
+#if SENTRY_HAS_METRIC_KIT
+
+NS_ASSUME_NONNULL_BEGIN
+
+API_AVAILABLE(ios(14.0), macos(12.0))
+API_UNAVAILABLE(tvos, watchos)
+@interface SentryMetricKitIntegration
+    : SentryBaseIntegration <SentryIntegrationProtocol, SentryMXManagerDelegate>
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif
diff --git a/Sources/Swift/MetricKit/SentryMXCallStackTree.swift b/Sources/Swift/MetricKit/SentryMXCallStackTree.swift
new file mode 100644
index 0000000000..47f56735a1
--- /dev/null
+++ b/Sources/Swift/MetricKit/SentryMXCallStackTree.swift
@@ -0,0 +1,62 @@
+import Foundation
+
+#if os(iOS) || os(macOS)
+/**
+ * JSON specification of MXCallStackTree can be found here https://developer.apple.com/documentation/metrickit/mxcallstacktree/3552293-jsonrepresentation.
+ */
+@objc
+public class SentryMXCallStackTree: NSObject, Codable {
+    
+    @objc public let callStacks: [SentryMXCallStack]
+    @objc public let callStackPerThread: Bool
+    
+    @objc public init(callStacks: [SentryMXCallStack], callStackPerThread: Bool) {
+        self.callStacks = callStacks
+        self.callStackPerThread = callStackPerThread
+    }
+    
+    public static func from(data: Data) throws -> SentryMXCallStackTree {
+        return try JSONDecoder().decode(SentryMXCallStackTree.self, from: data)
+    }
+}
+
+@objc
+public class SentryMXCallStack: NSObject, Codable {
+    public var threadAttributed: Bool?
+    public var callStackRootFrames: [SentryMXFrame]
+    
+    @objc public var flattenedRootFrames: [SentryMXFrame] {
+        return callStackRootFrames.flatMap { [$0] + $0.frames }
+    }
+
+    public init(threadAttributed: Bool, rootFrames: [SentryMXFrame]) {
+        self.threadAttributed = threadAttributed
+        self.callStackRootFrames = rootFrames
+    }
+}
+
+@objc
+public class SentryMXFrame: NSObject, Codable {
+    public var binaryUUID: UUID
+    @objc public var offsetIntoBinaryTextSegment: Int
+    @objc public var binaryName: String?
+    @objc public var address: UInt64
+    public var subFrames: [SentryMXFrame]?
+    
+    public var sampleCount: Int?
+    
+    public init(binaryUUID: UUID, offsetIntoBinaryTextSegment: Int, sampleCount: Int? = nil, binaryName: String? = nil, address: UInt64, subFrames: [SentryMXFrame]?) {
+        self.binaryUUID = binaryUUID
+        self.offsetIntoBinaryTextSegment = offsetIntoBinaryTextSegment
+        self.sampleCount = sampleCount
+        self.binaryName = binaryName
+        self.address = address
+        self.subFrames = subFrames
+    }
+    
+    public var frames: [SentryMXFrame] {
+        return subFrames?.flatMap { [$0] + $0.frames } ?? []
+    }
+}
+
+#endif
diff --git a/Sources/Swift/MetricKit/SentryMXManager.swift b/Sources/Swift/MetricKit/SentryMXManager.swift
new file mode 100644
index 0000000000..f46c577bf7
--- /dev/null
+++ b/Sources/Swift/MetricKit/SentryMXManager.swift
@@ -0,0 +1,72 @@
+import Foundation
+
+#if os(iOS) || os(macOS)
+
+/**
+ * We need to check if MetricKit is available for compatibility on iOS 12 and below. As there are no compiler directives for iOS versions we use canImport.
+ */
+#if canImport(MetricKit)
+import MetricKit
+#endif
+
+@available(iOS 14.0, macOS 12.0, *)
+@available(tvOS, unavailable)
+@available(watchOS, unavailable)
+@objc public protocol SentryMXManagerDelegate: AnyObject {
+    
+    func didReceiveCrashDiagnostic(_ diagnostic: MXCrashDiagnostic, callStackTree: SentryMXCallStackTree, timeStampBegin: Date, timeStampEnd: Date)
+    
+    func didReceiveDiskWriteExceptionDiagnostic(_ diagnostic: MXDiskWriteExceptionDiagnostic, callStackTree: SentryMXCallStackTree, timeStampBegin: Date, timeStampEnd: Date)
+    
+    func didReceiveCpuExceptionDiagnostic(_ diagnostic: MXCPUExceptionDiagnostic, callStackTree: SentryMXCallStackTree, timeStampBegin: Date, timeStampEnd: Date)
+}
+
+@available(iOS 14.0, macOS 12.0, *)
+@available(tvOS, unavailable)
+@available(watchOS, unavailable)
+@objcMembers public class SentryMXManager: NSObject, MXMetricManagerSubscriber {
+
+    public weak var delegate: SentryMXManagerDelegate?
+    
+    public func receiveReports() {
+        let shared = MXMetricManager.shared
+        shared.add(self)
+    }
+    
+    public func pauseReports() {
+        let shared = MXMetricManager.shared
+        shared.remove(self)
+    }
+    
+    public func didReceive(_ payloads: [MXDiagnosticPayload]) {
+        func actOn(callStackTree: MXCallStackTree, action: (SentryMXCallStackTree) -> Void) {
+            guard let callStackTree = try? SentryMXCallStackTree.from(data: callStackTree.jsonRepresentation()) else {
+                return
+            }
+            
+            action(callStackTree)
+        }
+        
+        payloads.forEach { payload in
+            payload.crashDiagnostics?.forEach { diagnostic in
+                actOn(callStackTree: diagnostic.callStackTree) { callStackTree in
+                    delegate?.didReceiveCrashDiagnostic(diagnostic, callStackTree: callStackTree, timeStampBegin: payload.timeStampBegin, timeStampEnd: payload.timeStampEnd)
+                }
+            }
+            
+            payload.diskWriteExceptionDiagnostics?.forEach { diagnostic in
+                actOn(callStackTree: diagnostic.callStackTree) { callStackTree in
+                    delegate?.didReceiveDiskWriteExceptionDiagnostic(diagnostic, callStackTree: callStackTree, timeStampBegin: payload.timeStampBegin, timeStampEnd: payload.timeStampEnd)
+                }
+            }
+            
+            payload.cpuExceptionDiagnostics?.forEach { diagnostic in
+                actOn(callStackTree: diagnostic.callStackTree) { callStackTree in
+                    delegate?.didReceiveCpuExceptionDiagnostic(diagnostic, callStackTree: callStackTree, timeStampBegin: payload.timeStampBegin, timeStampEnd: payload.timeStampEnd)
+                }
+            }
+        }
+    }
+}
+
+#endif
diff --git a/Tests/Resources/metric-kit-callstack-tree-garbage.json b/Tests/Resources/metric-kit-callstack-tree-garbage.json
new file mode 100644
index 0000000000..1dd51cbf3b
--- /dev/null
+++ b/Tests/Resources/metric-kit-callstack-tree-garbage.json
@@ -0,0 +1,23 @@
+{
+  "callStacks": [
+    {
+      "threadAttributed": true,
+      "callStackRootFrames": [
+        {
+          "binaryUUID": "9E8D8DE6-EEC1-3199-8720-9ED68EE3F967",
+          "offsetIntoBinaryTextSegment": 414732,
+          "sampleCount": 1,
+          "subFrames": [
+            {
+              "binaryUUID": "CA12CAFA-91BA-3E1C-BE9C-E34DB96FE7DF",
+              "offsetIntoBinaryTextSegment": 46380,
+              "sampleCount": 1,
+              "binaryName": "iOS-Swift",
+              "address": 4310988076
+            }
+          ],
+          "binaryName": "Sentry",
+          "address": 4312798220
+        }
+      ]
+    
diff --git a/Tests/Resources/metric-kit-callstack-tree-real.json b/Tests/Resources/metric-kit-callstack-tree-real.json
new file mode 100644
index 0000000000..f109decf25
--- /dev/null
+++ b/Tests/Resources/metric-kit-callstack-tree-real.json
@@ -0,0 +1,881 @@
+{
+  "callStacks": [
+    {
+      "threadAttributed": true,
+      "callStackRootFrames": [
+        {
+          "binaryUUID": "9E8D8DE6-EEC1-3199-8720-9ED68EE3F967",
+          "offsetIntoBinaryTextSegment": 414732,
+          "sampleCount": 1,
+          "subFrames": [
+            {
+              "binaryUUID": "CA12CAFA-91BA-3E1C-BE9C-E34DB96FE7DF",
+              "offsetIntoBinaryTextSegment": 46380,
+              "sampleCount": 1,
+              "subFrames": [
+                {
+                  "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                  "offsetIntoBinaryTextSegment": 2420052,
+                  "sampleCount": 1,
+                  "subFrames": [
+                    {
+                      "binaryUUID": "9E8D8DE6-EEC1-3199-8720-9ED68EE3F967",
+                      "offsetIntoBinaryTextSegment": 294996,
+                      "sampleCount": 1,
+                      "subFrames": [
+                        {
+                          "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                          "offsetIntoBinaryTextSegment": 2419252,
+                          "sampleCount": 1,
+                          "subFrames": [
+                            {
+                              "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                              "offsetIntoBinaryTextSegment": 2417608,
+                              "sampleCount": 1,
+                              "subFrames": [
+                                {
+                                  "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                  "offsetIntoBinaryTextSegment": 2417260,
+                                  "sampleCount": 1,
+                                  "subFrames": [
+                                    {
+                                      "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                      "offsetIntoBinaryTextSegment": 2416292,
+                                      "sampleCount": 1,
+                                      "subFrames": [
+                                        {
+                                          "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                          "offsetIntoBinaryTextSegment": 1034344,
+                                          "sampleCount": 1,
+                                          "subFrames": [
+                                            {
+                                              "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                              "offsetIntoBinaryTextSegment": 1031300,
+                                              "sampleCount": 1,
+                                              "subFrames": [
+                                                {
+                                                  "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                  "offsetIntoBinaryTextSegment": 1027908,
+                                                  "sampleCount": 1,
+                                                  "subFrames": [
+                                                    {
+                                                      "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                      "offsetIntoBinaryTextSegment": 1025536,
+                                                      "sampleCount": 1,
+                                                      "subFrames": [
+                                                        {
+                                                          "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                          "offsetIntoBinaryTextSegment": 1319908,
+                                                          "sampleCount": 1,
+                                                          "subFrames": [
+                                                            {
+                                                              "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                              "offsetIntoBinaryTextSegment": 14237860,
+                                                              "sampleCount": 1,
+                                                              "subFrames": [
+                                                                {
+                                                                  "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                                  "offsetIntoBinaryTextSegment": 6629184,
+                                                                  "sampleCount": 1,
+                                                                  "subFrames": [
+                                                                    {
+                                                                      "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                                      "offsetIntoBinaryTextSegment": 13213648,
+                                                                      "sampleCount": 1,
+                                                                      "subFrames": [
+                                                                        {
+                                                                          "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                                          "offsetIntoBinaryTextSegment": 13210012,
+                                                                          "sampleCount": 1,
+                                                                          "subFrames": [
+                                                                            {
+                                                                              "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
+                                                                              "offsetIntoBinaryTextSegment": 876372,
+                                                                              "sampleCount": 1,
+                                                                              "subFrames": [
+                                                                                {
+                                                                                  "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
+                                                                                  "offsetIntoBinaryTextSegment": 926508,
+                                                                                  "sampleCount": 1,
+                                                                                  "subFrames": [
+                                                                                    {
+                                                                                      "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
+                                                                                      "offsetIntoBinaryTextSegment": 418320,
+                                                                                      "sampleCount": 1,
+                                                                                      "subFrames": [
+                                                                                        {
+                                                                                          "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
+                                                                                          "offsetIntoBinaryTextSegment": 506792,
+                                                                                          "sampleCount": 1,
+                                                                                          "subFrames": [
+                                                                                            {
+                                                                                              "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
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+                                                                                              "sampleCount": 1,
+                                                                                              "subFrames": [
+                                                                                                {
+                                                                                                  "binaryUUID": "A633A095-1226-3942-8F41-3877660185EE",
+                                                                                                  "offsetIntoBinaryTextSegment": 4968,
+                                                                                                  "sampleCount": 1,
+                                                                                                  "subFrames": [
+                                                                                                    {
+                                                                                                      "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                                                                      "offsetIntoBinaryTextSegment": 3810256,
+                                                                                                      "sampleCount": 1,
+                                                                                                      "subFrames": [
+                                                                                                        {
+                                                                                                          "binaryUUID": "179501B6-0FC2-344A-B969-B4E3961EBE10",
+                                                                                                          "offsetIntoBinaryTextSegment": 3809332,
+                                                                                                          "sampleCount": 1,
+                                                                                                          "subFrames": [
+                                                                                                            {
+                                                                                                              "binaryUUID": "CA12CAFA-91BA-3E1C-BE9C-E34DB96FE7DF",
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+                                                                                                              "sampleCount": 1,
+                                                                                                              "subFrames": [
+                                                                                                                {
+                                                                                                                  "binaryUUID": "CB3FF411-4762-34D2-86A4-ECA13F9FB6C3",
+                                                                                                                  "offsetIntoBinaryTextSegment": 88416,
+                                                                                                                  "sampleCount": 1,
+                                                                                                                  "binaryName": "dyld",
+                                                                                                                  "address": 7091980640
+                                                                                                                }
+                                                                                                              ],
+                                                                                                              "binaryName": "iOS-Swift",
+                                                                                                              "address": 4310976644
+                                                                                                            }
+                                                                                                          ],
+                                                                                                          "binaryName": "UIKitCore",
+                                                                                                          "address": 6620606516
+                                                                                                        }
+                                                                                                      ],
+                                                                                                      "binaryName": "UIKitCore",
+                                                                                                      "address": 6620607440
+                                                                                                    }
+                                                                                                  ],
+                                                                                                  "binaryName": "GraphicsServices",
+                                                                                                  "address": 7541384040
+                                                                                                }
+                                                                                              ],
+                                                                                              "binaryName": "CoreFoundation",
+                                                                                              "address": 6581948116
+                                                                                            }
+                                                                                          ],
+                                                                                          "binaryName": "CoreFoundation",
+                                                                                          "address": 6581926824
+                                                                                        }
+                                                                                      ],
+                                                                                      "binaryName": "CoreFoundation",
+                                                                                      "address": 6581838352
+                                                                                    }
+                                                                                  ],
+                                                                                  "binaryName": "CoreFoundation",
+                                                                                  "address": 6582346540
+                                                                                }
+                                                                              ],
+                                                                              "binaryName": "CoreFoundation",
+                                                                              "address": 6582296404
+                                                                            }
+                                                                          ],
+                                                                          "binaryName": "UIKitCore",
+                                                                          "address": 6630007196
+                                                                        }
+                                                                      ],
+                                                                      "binaryName": "UIKitCore",
+                                                                      "address": 6630010832
+                                                                    }
+                                                                  ],
+                                                                  "binaryName": "UIKitCore",
+                                                                  "address": 6623426368
+                                                                }
+                                                              ],
+                                                              "binaryName": "UIKitCore",
+                                                              "address": 6631035044
+                                                            }
+                                                          ],
+                                                          "binaryName": "UIKitCore",
+                                                          "address": 6618117092
+                                                        }
+                                                      ],
+                                                      "binaryName": "UIKitCore",
+                                                      "address": 6617822720
+                                                    }
+                                                  ],
+                                                  "binaryName": "UIKitCore",
+                                                  "address": 6617825092
+                                                }
+                                              ],
+                                              "binaryName": "UIKitCore",
+                                              "address": 6617828484
+                                            }
+                                          ],
+                                          "binaryName": "UIKitCore",
+                                          "address": 6617831528
+                                        }
+                                      ],
+                                      "binaryName": "UIKitCore",
+                                      "address": 6619213476
+                                    }
+                                  ],
+                                  "binaryName": "UIKitCore",
+                                  "address": 6619214444
+                                }
+                              ],
+                              "binaryName": "UIKitCore",
+                              "address": 6619214792
+                            }
+                          ],
+                          "binaryName": "UIKitCore",
+                          "address": 6619216436
+                        }
+                      ],
+                      "binaryName": "Sentry",
+                      "address": 4312678484
+                    }
+                  ],
+                  "binaryName": "UIKitCore",
+                  "address": 6619217236
+                }
+              ],
+              "binaryName": "iOS-Swift",
+              "address": 4310988076
+            }
+          ],
+          "binaryName": "Sentry",
+          "address": 4312798220
+        }
+      ]
+    },
+    {
+      "threadAttributed": false,
+      "callStackRootFrames": [
+        {
+          "binaryUUID": "FF27FC8F-90BA-3332-AB7A-C5BC2D9CA7B1",
+          "offsetIntoBinaryTextSegment": 2888,
+          "sampleCount": 1,
+          "subFrames": [
+            {
+              "binaryUUID": "FF27FC8F-90BA-3332-AB7A-C5BC2D9CA7B1",
+              "offsetIntoBinaryTextSegment": 77832,
+              "sampleCount": 1,
+              "subFrames": [
+                {
+                  "binaryUUID": "FF27FC8F-90BA-3332-AB7A-C5BC2D9CA7B1",
+                  "offsetIntoBinaryTextSegment": 78408,
+                  "sampleCount": 1,
+                  "subFrames": [
+                    {
+                      "binaryUUID": "FF27FC8F-90BA-3332-AB7A-C5BC2D9CA7B1",
+                      "offsetIntoBinaryTextSegment": 4236,
+                      "sampleCount": 1,
+                      "subFrames": [
+                        {
+                          "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
+                          "offsetIntoBinaryTextSegment": 502512,
+                          "sampleCount": 1,
+                          "subFrames": [
+                            {
+                              "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
+                              "offsetIntoBinaryTextSegment": 507188,
+                              "sampleCount": 1,
+                              "subFrames": [
+                                {
+                                  "binaryUUID": "5CDC5D9A-E506-3740-B64E-BB30867B4F1B",
+                                  "offsetIntoBinaryTextSegment": 528084,
+                                  "sampleCount": 1,
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+          ],
+          "binaryName": "Sentry",
+          "address": 4312798220
+        }
+      ]
+    }
+  ],
+  "callStackPerThread": true,
+  "unkownField": true
+}
diff --git a/Tests/SentryTests/Integrations/MetricKit/SentryMXCallStackTreeTests.swift b/Tests/SentryTests/Integrations/MetricKit/SentryMXCallStackTreeTests.swift
new file mode 100644
index 0000000000..ef29a1f3a3
--- /dev/null
+++ b/Tests/SentryTests/Integrations/MetricKit/SentryMXCallStackTreeTests.swift
@@ -0,0 +1,76 @@
+#if os(iOS) || os(macOS)
+import SentryPrivate
+import XCTest
+
+/**
+ * We need to check if MetricKit is available for compatibility on iOS 12 and below. As there are no compiler directives for iOS versions we use canImport
+ */
+#if canImport(MetricKit)
+import MetricKit
+#endif
+
+final class SentryMXCallStackTreeTests: XCTestCase {
+    
+    func testDecodeCallStackTree_Simple() throws {
+        let contents = try contentsOfResource("metric-kit-callstack-tree-simple")
+        let callStackTree = try SentryMXCallStackTree.from(data: contents)
+        
+        try assertSimpleCallStackTree(callStackTree)
+    }
+    
+    func testDecodeCallStackTree_UnknownFieldsPayload() throws {
+        let contents = try contentsOfResource("metric-kit-callstack-tree-unknown-fields")
+        let callStackTree = try SentryMXCallStackTree.from(data: contents)
+        
+        try assertSimpleCallStackTree(callStackTree)
+    }
+    
+    func testDecodeCallStackTree_RealPayload() throws {
+        let contents = try contentsOfResource("metric-kit-callstack-tree-real")
+        let callStackTree = try SentryMXCallStackTree.from(data: contents)
+        
+        XCTAssertNotNil(callStackTree)
+        
+        // Only validate some properties as this only validates that we can
+        // decode a real payload
+        XCTAssertEqual(16, callStackTree.callStacks.count)
+        XCTAssertEqual(27, callStackTree.callStacks[0].flattenedRootFrames.count)
+    }
+    
+    func testDecodeCallStackTree_GarbagePayload() throws {
+        let contents = try contentsOfResource("metric-kit-callstack-tree-garbage")
+        XCTAssertThrowsError(try SentryMXCallStackTree.from(data: contents))
+    }
+    
+    private func assertSimpleCallStackTree(_ callStackTree: SentryMXCallStackTree) throws {
+        XCTAssertNotNil(callStackTree)
+        XCTAssertTrue(callStackTree.callStackPerThread)
+        
+        XCTAssertEqual(1, callStackTree.callStacks.count)
+        
+        let callStack = try XCTUnwrap(callStackTree.callStacks.first)
+        XCTAssertTrue(callStack.threadAttributed ?? false)
+        
+        XCTAssertEqual(2, callStack.flattenedRootFrames.count)
+        
+        let firstFrame = try XCTUnwrap(callStack.flattenedRootFrames[0])
+        XCTAssertEqual(UUID(uuidString: "9E8D8DE6-EEC1-3199-8720-9ED68EE3F967"), firstFrame.binaryUUID)
+        XCTAssertEqual(414_732, firstFrame.offsetIntoBinaryTextSegment)
+        XCTAssertEqual(1, firstFrame.sampleCount)
+        XCTAssertEqual("Sentry", firstFrame.binaryName)
+        XCTAssertEqual(4_312_798_220, firstFrame.address)
+        XCTAssertEqual(1, firstFrame.subFrames?.count)
+        
+        let secondFrame = try XCTUnwrap(callStack.flattenedRootFrames[1])
+        XCTAssertEqual(UUID(uuidString: "CA12CAFA-91BA-3E1C-BE9C-E34DB96FE7DF"), secondFrame.binaryUUID)
+        XCTAssertEqual(46_380, secondFrame.offsetIntoBinaryTextSegment)
+        XCTAssertEqual(1, secondFrame.sampleCount)
+        XCTAssertEqual("iOS-Swift", secondFrame.binaryName)
+        XCTAssertEqual(4_310_988_076, secondFrame.address)
+        XCTAssertNil(secondFrame.subFrames)
+        
+        XCTAssertEqual(try XCTUnwrap(firstFrame.subFrames?[0]), secondFrame)
+    }
+}
+
+#endif
diff --git a/Tests/SentryTests/Integrations/MetricKit/SentryMetricKitIntegrationTests.swift b/Tests/SentryTests/Integrations/MetricKit/SentryMetricKitIntegrationTests.swift
new file mode 100644
index 0000000000..87e1b2a35e
--- /dev/null
+++ b/Tests/SentryTests/Integrations/MetricKit/SentryMetricKitIntegrationTests.swift
@@ -0,0 +1,144 @@
+import Sentry
+import SentryPrivate
+import XCTest
+
+#if os(iOS) || os(macOS)
+
+/**
+ * We need to check if MetricKit is available for compatibility on iOS 12 and below. As there are no compiler directives for iOS versions we use canImport.
+ */
+#if canImport(MetricKit)
+import MetricKit
+#endif
+
+final class SentryMetricKitIntegrationTests: SentrySDKIntegrationTestsBase {
+    
+    private var callStackTree: SentryMXCallStackTree!
+    
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+        
+        let contents = try contentsOfResource("metric-kit-callstack-tree-simple")
+        callStackTree = try SentryMXCallStackTree.from(data: contents)
+    }
+
+    func testOptionEnabled_MetricKitManagerInitialized() {
+        if #available(iOS 14, macOS 12, *) {
+            let sut = SentryMetricKitIntegration()
+            
+            givenInstalledWithEnabled(sut)
+            
+            XCTAssertNotNil(Dynamic(sut).metricKitManager as SentryMXManager?)
+        }
+    }
+    
+    func testOptionDisabled_MetricKitManagerNotInitialized() {
+        if #available(iOS 14, macOS 12, *) {
+            let sut = SentryMetricKitIntegration()
+            
+            sut.install(with: Options())
+            
+            XCTAssertNil(Dynamic(sut).metricKitManager as SentryMXManager?)
+        }
+    }
+    
+    func testUninstall_MetricKitManagerSetToNil() {
+        if #available(iOS 14, macOS 12, *) {
+            let sut = SentryMetricKitIntegration()
+            
+            let options = Options()
+            options.enableMetricKit = true
+            sut.install(with: options)
+            sut.uninstall()
+            
+            XCTAssertNil(Dynamic(sut).metricKitManager as SentryMXManager?)
+        }
+    }
+    
+    func testMXCrashPayloadReceived() throws {
+        if #available(iOS 14, macOS 12, *) {
+            givenSdkWithHub()
+            let sut = SentryMetricKitIntegration()
+            givenInstalledWithEnabled(sut)
+            
+            Dynamic(sut).didReceiveCrashDiagnostic(MXCrashDiagnostic(), callStackTree: callStackTree, timeStampBegin: currentDate.date(), timeStampEnd: currentDate.date())
+            
+            assertMXEvent(exceptionType: "MXCrashDiagnostic", exceptionValue: "MachException Type:(null) Code:(null) Signal:(null)")
+        }
+    }
+    
+    func testCPUExceptionDiagnostic() throws {
+        if #available(iOS 14, macOS 12, *) {
+            givenSdkWithHub()
+            
+            let sut = SentryMetricKitIntegration()
+            givenInstalledWithEnabled(sut)
+            
+            Dynamic(sut).didReceiveCpuExceptionDiagnostic(TestMXCPUExceptionDiagnostic(), callStackTree: callStackTree, timeStampBegin: currentDate.date(), timeStampEnd: currentDate.date())
+            
+            assertMXEvent(exceptionType: "MXCPUException", exceptionValue: "MXCPUException totalCPUTime:2.2 ms totalSampledTime:5.5 ms")
+        }
+    }
+    
+    func testDiskWriteExceptionDiagnostic() throws {
+        if #available(iOS 14, macOS 12, *) {
+            givenSdkWithHub()
+            
+            let sut = SentryMetricKitIntegration()
+            givenInstalledWithEnabled(sut)
+            
+            Dynamic(sut).didReceiveDiskWriteExceptionDiagnostic(TestMXDiskWriteExceptionDiagnostic(), callStackTree: callStackTree, timeStampBegin: currentDate.date(), timeStampEnd: currentDate.date())
+            
+            assertMXEvent(exceptionType: "MXDiskWriteException", exceptionValue: "MXDiskWriteException totalWritesCaused:5.5 Mib")
+        }
+    }
+    
+    @available(iOS 14, macOS 12, *)
+    @available(tvOS, unavailable)
+    @available(watchOS, unavailable)
+    private func givenInstalledWithEnabled(_ integration: SentryMetricKitIntegration) {
+        let options = Options()
+        options.enableMetricKit = true
+        integration.install(with: options)
+    }
+    
+    @available(iOS 14, macOS 12, *)
+    @available(tvOS, unavailable)
+    @available(watchOS, unavailable)
+    private func assertMXEvent(exceptionType: String, exceptionValue: String) {
+        assertEventWithScopeCaptured { e, _, _ in
+            let event = try! XCTUnwrap(e)
+            XCTAssertEqual(callStackTree.callStacks.count, event.threads?.count)
+            
+            XCTAssertEqual(1, event.exceptions?.count)
+            let exception = try! XCTUnwrap(event.exceptions?.first)
+            
+            XCTAssertEqual(exceptionType, exception.type)
+            XCTAssertEqual(exceptionValue, exception.value)
+        }
+    }
+}
+
+@available(iOS 14, macOS 12, *)
+@available(tvOS, unavailable)
+@available(watchOS, unavailable)
+class TestMXCPUExceptionDiagnostic: MXCPUExceptionDiagnostic {
+    override var totalCPUTime: Measurement<UnitDuration> {
+        return Measurement(value: 2.2, unit: .milliseconds)
+    }
+    
+    override var totalSampledTime: Measurement<UnitDuration> {
+        return Measurement(value: 5.5, unit: .milliseconds)
+    }
+}
+
+@available(iOS 14, macOS 12, *)
+@available(tvOS, unavailable)
+@available(watchOS, unavailable)
+class TestMXDiskWriteExceptionDiagnostic: MXDiskWriteExceptionDiagnostic {
+    override var totalWritesCaused: Measurement<UnitInformationStorage> {
+        return Measurement(value: 5.5, unit: .mebibits)
+    }
+}
+
+#endif
diff --git a/Tests/SentryTests/Integrations/Performance/Network/SentryNSURLSessionTaskSearchTests.swift b/Tests/SentryTests/Integrations/Performance/Network/SentryNSURLSessionTaskSearchTests.swift
index 043ec10836..adb79d698d 100644
--- a/Tests/SentryTests/Integrations/Performance/Network/SentryNSURLSessionTaskSearchTests.swift
+++ b/Tests/SentryTests/Integrations/Performance/Network/SentryNSURLSessionTaskSearchTests.swift
@@ -13,5 +13,5 @@ class SentryNSURLSessionTaskSearchTests: XCTestCase {
             XCTAssertEqual(String(describing: classes.first!), "__NSCFURLSessionTask")
         }
     }
-    
+
 }
diff --git a/Tests/SentryTests/SentryOptionsTest.m b/Tests/SentryTests/SentryOptionsTest.m
index 380c80063e..1059cb7f9e 100644
--- a/Tests/SentryTests/SentryOptionsTest.m
+++ b/Tests/SentryTests/SentryOptionsTest.m
@@ -120,6 +120,12 @@ - (void)assertDefaultValues:(SentryOptions *)options
     XCTAssertEqual(NO, options.enableFileIOTracing);
     XCTAssertEqual(YES, options.enableAutoBreadcrumbTracking);
 
+#if SENTRY_HAS_METRIC_KIT
+    if (@available(iOS 14.0, macOS 12.0, macCatalyst 14.0, *)) {
+        XCTAssertEqual(NO, options.enableMetricKit);
+    }
+#endif
+
     NSRegularExpression *regexTrace = options.tracePropagationTargets[0];
     XCTAssertTrue([regexTrace.pattern isEqualToString:@".*"]);
 
diff --git a/Tests/SentryTests/SentryTests-Bridging-Header.h b/Tests/SentryTests/SentryTests-Bridging-Header.h
index e8d251dc70..60b12c8532 100644
--- a/Tests/SentryTests/SentryTests-Bridging-Header.h
+++ b/Tests/SentryTests/SentryTests-Bridging-Header.h
@@ -99,6 +99,7 @@
 #import "SentryMechanism.h"
 #import "SentryMechanismMeta.h"
 #import "SentryMeta.h"
+#import "SentryMetricKitIntegration.h"
 #import "SentryMigrateSessionInit.h"
 #import "SentryNSDataTracker.h"
 #import "SentryNSError.h"
diff --git a/Tests/SentryTests/TestUtils/TestExtensions.swift b/Tests/SentryTests/TestUtils/TestExtensions.swift
index a5b1aed784..52c8cf3947 100644
--- a/Tests/SentryTests/TestUtils/TestExtensions.swift
+++ b/Tests/SentryTests/TestUtils/TestExtensions.swift
@@ -1,4 +1,5 @@
 import Foundation
+import XCTest
 
 extension TimeInterval {
     func toNanoSeconds() -> UInt64 {
@@ -11,3 +12,10 @@ extension UInt64 {
         return Double(self) / Double(NSEC_PER_SEC)
     }
 }
+
+extension XCTest {
+    func contentsOfResource(_ resource: String, ofType: String = "json") throws -> Data {
+        let path = Bundle(for: type(of: self)).path(forResource: "Resources/\(resource)", ofType: "json")
+        return try Data(contentsOf: URL(fileURLWithPath: path ?? ""))
+    }
+}