diff --git a/SampleApps/WebView2APISample/AppWindow.cpp b/SampleApps/WebView2APISample/AppWindow.cpp
index 02ad74c..1c33cbb 100644
--- a/SampleApps/WebView2APISample/AppWindow.cpp
+++ b/SampleApps/WebView2APISample/AppWindow.cpp
@@ -39,6 +39,7 @@
 #include "ScenarioDedicatedWorker.h"
 #include "ScenarioDedicatedWorkerPostMessage.h"
 #include "ScenarioDefaultBackgroundColor.h"
+#include "ScenarioDiagnosticMonitor.h"
 #include "ScenarioDragDrop.h"
 #include "ScenarioDragDropOverride.h"
 #include "ScenarioExtensionsManagement.h"
@@ -48,12 +49,12 @@
 #include "ScenarioNavigateWithWebResourceRequest.h"
 #include "ScenarioNonClientRegionSupport.h"
 #include "ScenarioNotificationReceived.h"
+#include "ScenarioOriginConfigurationAPI.h"
 #include "ScenarioPermissionManagement.h"
 #include "ScenarioServiceWorkerManager.h"
 #include "ScenarioServiceWorkerPostMessage.h"
 #include "ScenarioServiceWorkerPostMessageSetting.h"
 #include "ScenarioSharedWorkerManager.h"
-#include "ScenarioOriginConfigurationAPI.h"
 #include "ScenarioSaveAs.h"
 #include "ScenarioScreenCapture.h"
 #include "ScenarioSensitivityLabel.h"
@@ -620,6 +621,28 @@ bool AppWindow::ExecuteWebViewCommands(WPARAM wParam, LPARAM lParam)
         }
         return true;
     }
+    case IDM_SCENARIO_DIAGNOSTIC_CREATE_MONITOR:
+    {
+        auto* scenario = GetComponent<ScenarioDiagnosticMonitor>();
+        if (!scenario)
+        {
+            NewComponent<ScenarioDiagnosticMonitor>(this);
+            scenario = GetComponent<ScenarioDiagnosticMonitor>();
+        }
+        if (scenario)
+        {
+            scenario->CreateMonitorWithDialog();
+        }
+        return true;
+    }
+    case IDM_SCENARIO_DIAGNOSTIC_CLEAR_ALL:
+    {
+        if (auto* scenario = GetComponent<ScenarioDiagnosticMonitor>())
+        {
+            scenario->ClearAllMonitors();
+        }
+        return true;
+    }
     case IDM_SCENARIO_CUSTOM_SCHEME:
     {
         NewComponent<ScenarioCustomScheme>(this);
diff --git a/SampleApps/WebView2APISample/ScenarioDiagnosticMonitor.cpp b/SampleApps/WebView2APISample/ScenarioDiagnosticMonitor.cpp
new file mode 100644
index 0000000..8c858ed
--- /dev/null
+++ b/SampleApps/WebView2APISample/ScenarioDiagnosticMonitor.cpp
@@ -0,0 +1,247 @@
+// Copyright (C) Microsoft Corporation. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "stdafx.h"
+
+#include "ScenarioDiagnosticMonitor.h"
+
+#include <sstream>
+#include <string>
+
+#include "App.h"
+#include "CheckFailure.h"
+#include "TextInputDialog.h"
+#include "Util.h"
+#include "resource.h"
+
+using namespace Microsoft::WRL;
+
+ScenarioDiagnosticMonitor::ScenarioDiagnosticMonitor(AppWindow* appWindow)
+    : m_appWindow(appWindow)
+{
+    wil::com_ptr<ICoreWebView2ExperimentalEnvironment16> env16;
+    HRESULT hr = m_appWindow->GetWebViewEnvironment()->QueryInterface(IID_PPV_ARGS(&env16));
+    if (FAILED(hr) || !env16)
+    {
+        MessageBox(
+            m_appWindow->GetMainWindow(),
+            L"ICoreWebView2ExperimentalEnvironment16 not available. "
+            L"The Diagnostic API requires a newer WebView2 Runtime.",
+            L"Diagnostic Monitor", MB_OK);
+        return;
+    }
+    m_environment16 = env16;
+}
+
+ScenarioDiagnosticMonitor::~ScenarioDiagnosticMonitor()
+{
+    ClearAllMonitors();
+}
+
+void ScenarioDiagnosticMonitor::CreateMonitorWithDialog()
+{
+    if (!m_environment16)
+    {
+        return;
+    }
+
+    // Default monitor name.
+    std::wstringstream defaultName;
+    defaultName << L"Diagnostic Monitor " << m_nextMonitorId;
+
+    // The filter dialog label is used both as a UI prompt and as the
+    // lookup key in `dialog.results`, so keep it in a single constant.
+    // The example matches the JSON schema documented for the
+    // NETWORK_REQUEST category in environment.idl.
+    static constexpr wchar_t kFilterLabel[] =
+        L"Example filter:\r\n"
+        L"{\r\n"
+        L"  \"errorCode\":  [-105, -7],\r\n"
+        L"  \"statusCode\": [404, 500],\r\n"
+        L"  \"uriPattern\": [\"https://*.contoso.com/*\"],\r\n"
+        L"  \"httpMethod\": [\"GET\", \"POST\"]\r\n"
+        L"}\r\n"
+        L"\r\n"
+        L"Match any value within a field (OR).\r\n"
+        L"All specified fields must match (AND).\r\n"
+        L"Leave empty to receive all events.";
+
+    // Show a single dialog with monitor name, category dropdown, and JSON filter.
+    TextInputDialog dialog = TextInputDialog::Builder(
+                                 m_appWindow->GetMainWindow(), L"Create Diagnostic Monitor",
+                                 L"Configure the monitor and its filter")
+                                 .AddTextArea(L"Monitor Name", defaultName.str(), false, 20, 24)
+                                 .AddDropDown(L"Category", {L"NETWORK_REQUEST"}, 0)
+                                 .AddTextArea(kFilterLabel, L"", false, 170, 80)
+                                 .Build();
+
+    if (!dialog.confirmed)
+    {
+        return;
+    }
+
+    // Read user inputs from the dialog results.
+    std::wstring monitorName = defaultName.str();
+    std::wstring jsonFilter;
+
+    auto nameIt = dialog.results.find(L"Monitor Name");
+    if (nameIt != dialog.results.end())
+    {
+        monitorName = std::get<TextArea>(nameIt->second).input;
+    }
+
+    auto filterIt = dialog.results.find(kFilterLabel);
+    if (filterIt != dialog.results.end())
+    {
+        jsonFilter = std::get<TextArea>(filterIt->second).input;
+    }
+
+    //! [CreateDiagnosticMonitor]
+    // Create the monitor.
+    wil::com_ptr<ICoreWebView2ExperimentalDiagnosticMonitor> monitor;
+    HRESULT hr = m_environment16->CreateDiagnosticMonitor(&monitor);
+    if (FAILED(hr))
+    {
+        std::wstringstream ss;
+        ss << L"CreateDiagnosticMonitor failed: 0x" << std::hex << hr;
+        MessageBox(
+            m_appWindow->GetMainWindow(), ss.str().c_str(), L"Diagnostic Monitor",
+            MB_OK | MB_ICONERROR);
+        return;
+    }
+
+    // Set filter for NETWORK_REQUEST category.
+    hr = monitor->SetDiagnosticFilter(
+        COREWEBVIEW2_DIAGNOSTIC_CATEGORY_NETWORK_REQUEST,
+        jsonFilter.empty() ? L"" : jsonFilter.c_str());
+    if (FAILED(hr))
+    {
+        std::wstringstream ss;
+        ss << L"SetDiagnosticFilter failed: 0x" << std::hex << hr;
+        MessageBox(
+            m_appWindow->GetMainWindow(), ss.str().c_str(), L"Diagnostic Monitor",
+            MB_OK | MB_ICONERROR);
+        return;
+    }
+
+    // Register the event handler. Capture the monitor name for logging.
+    std::wstring capturedName = monitorName;
+    EventRegistrationToken token;
+    CHECK_FAILURE(monitor->add_DiagnosticReceived(
+        Callback<ICoreWebView2ExperimentalDiagnosticReceivedEventHandler>(
+            [this, capturedName](
+                ICoreWebView2ExperimentalDiagnosticMonitor* sender,
+                ICoreWebView2ExperimentalDiagnosticReceivedEventArgs* args) -> HRESULT
+            {
+                COREWEBVIEW2_DIAGNOSTIC_CATEGORY category;
+                CHECK_FAILURE(args->get_Category(&category));
+
+                COREWEBVIEW2_DIAGNOSTIC_SCOPE scope;
+                CHECK_FAILURE(args->get_Scope(&scope));
+
+                INT64 timestamp = 0;
+                CHECK_FAILURE(args->get_Timestamp(&timestamp));
+
+                wil::unique_cotaskmem_string detailsJson;
+                CHECK_FAILURE(args->get_DetailsAsJson(&detailsJson));
+
+                m_totalEventCount++;
+
+                // Pretty-print the JSON details for readability.
+                std::wstring json = detailsJson.get();
+                std::wstringstream pretty;
+                int indent = 0;
+                bool inString = false;
+                wchar_t prevCh = 0;
+                for (wchar_t ch : json)
+                {
+                    if (ch == L'"' && prevCh != L'\\')
+                        inString = !inString;
+                    if (inString)
+                    {
+                        pretty << ch;
+                        prevCh = ch;
+                        continue;
+                    }
+                    if (ch == L'{' || ch == L'[')
+                    {
+                        pretty << ch << L"\r\n";
+                        indent += 2;
+                        for (int i = 0; i < indent; ++i)
+                            pretty << L' ';
+                    }
+                    else if (ch == L'}' || ch == L']')
+                    {
+                        pretty << L"\r\n";
+                        indent -= 2;
+                        for (int i = 0; i < indent; ++i)
+                            pretty << L' ';
+                        pretty << ch;
+                    }
+                    else if (ch == L',')
+                    {
+                        pretty << ch << L"\r\n";
+                        for (int i = 0; i < indent; ++i)
+                            pretty << L' ';
+                    }
+                    else
+                    {
+                        pretty << ch;
+                    }
+                    prevCh = ch;
+                }
+
+                std::wstringstream ss;
+                ss << L"Event #" << m_totalEventCount << L"\r\n"
+                   << L"Category: " << static_cast<int>(category) << L"  Scope: "
+                   << static_cast<int>(scope) << L"  Timestamp (ms since UNIX epoch): "
+                   << timestamp << L"\r\n\r\n"
+                   << L"Details:\r\n"
+                   << pretty.str();
+
+                MessageBox(
+                    m_appWindow->GetMainWindow(), ss.str().c_str(), capturedName.c_str(),
+                    MB_OK | MB_ICONINFORMATION);
+
+                return S_OK;
+            })
+            .Get(),
+        &token));
+    //! [CreateDiagnosticMonitor]
+
+    m_monitors.push_back({monitorName, monitor, token});
+    m_nextMonitorId++;
+
+    std::wstringstream msg;
+    msg << L"Created \"" << monitorName << L"\" with filter: "
+        << (jsonFilter.empty() ? L"(accept all)" : jsonFilter);
+    MessageBox(
+        m_appWindow->GetMainWindow(), msg.str().c_str(), L"Diagnostic Monitor",
+        MB_OK | MB_ICONINFORMATION);
+}
+
+void ScenarioDiagnosticMonitor::ClearAllMonitors()
+{
+    for (auto& entry : m_monitors)
+    {
+        if (entry.monitor)
+        {
+            CHECK_FAILURE(entry.monitor->remove_DiagnosticReceived(entry.token));
+            CHECK_FAILURE(entry.monitor->Close());
+        }
+    }
+    size_t count = m_monitors.size();
+    m_monitors.clear();
+    m_nextMonitorId = 1;
+    m_totalEventCount = 0;
+
+    if (count > 0)
+    {
+        std::wstringstream ss;
+        ss << L"Cleared " << count << L" monitor(s).";
+        MessageBox(
+            m_appWindow->GetMainWindow(), ss.str().c_str(), L"Diagnostic Monitor",
+            MB_OK | MB_ICONINFORMATION);
+    }
+}
diff --git a/SampleApps/WebView2APISample/ScenarioDiagnosticMonitor.h b/SampleApps/WebView2APISample/ScenarioDiagnosticMonitor.h
new file mode 100644
index 0000000..a5868da
--- /dev/null
+++ b/SampleApps/WebView2APISample/ScenarioDiagnosticMonitor.h
@@ -0,0 +1,42 @@
+// Copyright (C) Microsoft Corporation. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#pragma once
+#include "stdafx.h"
+
+#include <string>
+#include <vector>
+
+#include "AppWindow.h"
+#include "ComponentBase.h"
+
+// Scenario that demonstrates the Diagnostic Monitor API.
+// Supports creating multiple named monitors with per-category JSON filters,
+// and clearing all monitors. Each monitor logs received events to a message
+// box.
+class ScenarioDiagnosticMonitor : public ComponentBase
+{
+public:
+    ScenarioDiagnosticMonitor(AppWindow* appWindow);
+    ~ScenarioDiagnosticMonitor() override;
+
+    // Menu handlers called from AppWindow.
+    void CreateMonitorWithDialog();
+    void ClearAllMonitors();
+
+private:
+    struct MonitorEntry
+    {
+        std::wstring name;
+        wil::com_ptr<ICoreWebView2ExperimentalDiagnosticMonitor> monitor;
+        EventRegistrationToken token = {};
+    };
+
+    AppWindow* m_appWindow = nullptr;
+    wil::com_ptr<ICoreWebView2ExperimentalEnvironment16> m_environment16;
+
+    std::vector<MonitorEntry> m_monitors;
+    int m_nextMonitorId = 1;
+    int m_totalEventCount = 0;
+};
diff --git a/SampleApps/WebView2APISample/TextInputDialog.cpp b/SampleApps/WebView2APISample/TextInputDialog.cpp
index c8ce560..4961d19 100644
--- a/SampleApps/WebView2APISample/TextInputDialog.cpp
+++ b/SampleApps/WebView2APISample/TextInputDialog.cpp
@@ -20,8 +20,6 @@ static constexpr int kMaxOptionsPerGroup = 10;
 static constexpr int kCheckBoxHeight = 20;
 static constexpr int kCheckBoxSpacing = 4;
 static constexpr int kGroupLabelHeight = 18;
-static constexpr int kLabelHeight = 100;
-static constexpr int kTextAreaHeight = 120;
 static constexpr int kControlSpacing = 16;
 static constexpr int kLabelToInputSpacing = 6;
 
@@ -116,27 +114,62 @@ int CreateTextArea(
     HWND hDlg, TextArea& textArea, int controlId, int x, int y, int width, HFONT dialogFont)
 {
     HMENU hmenu = reinterpret_cast<HMENU>(static_cast<UINT_PTR>(controlId));
+    int labelH = textArea.labelHeight;
+    int inputH = textArea.inputHeight;
 
     // Read-only label EDIT — renders with a border and grey background.
-    // Uses an EDIT instead of STATIC so it supports scrolling for long text.
     HWND label = CreateWindowEx(
         WS_EX_CLIENTEDGE, L"EDIT", textArea.label.c_str(),
         WS_VISIBLE | WS_CHILD | ES_READONLY | ES_MULTILINE | ES_AUTOVSCROLL | WS_VSCROLL, x, y,
-        width, kLabelHeight, hDlg, NULL, GetModuleHandle(NULL), NULL);
+        width, labelH, hDlg, NULL, GetModuleHandle(NULL), NULL);
     SetControlFont(label, dialogFont);
 
     // Writable input EDIT — placed below the label for user text entry.
     HWND inputArea = CreateWindowEx(
         WS_EX_CLIENTEDGE, L"EDIT", textArea.input.c_str(),
         WS_VISIBLE | WS_CHILD | ES_MULTILINE | ES_AUTOVSCROLL, x,
-        y + kLabelHeight + kLabelToInputSpacing, width, kTextAreaHeight, hDlg, hmenu,
-        GetModuleHandle(NULL), NULL);
+        y + labelH + kLabelToInputSpacing, width, inputH, hDlg, hmenu, GetModuleHandle(NULL),
+        NULL);
     SetControlFont(inputArea, dialogFont);
     if (textArea.readOnly)
     {
         SendMessage(inputArea, EM_SETREADONLY, TRUE, 0);
     }
-    return kLabelHeight + kLabelToInputSpacing + kTextAreaHeight;
+    return labelH + kLabelToInputSpacing + inputH;
+}
+
+// Creates a dropdown (combo box) control: a STATIC label above a COMBOBOX.
+// The combo box is assigned |controlId| so its selection can be retrieved
+// later via GetDlgItem. Returns total pixel height consumed.
+static constexpr int kDropDownLabelHeight = 16;
+static constexpr int kDropDownHeight = 200; // drop-down list height (expanded)
+static constexpr int kDropDownControlHeight = 22;
+
+int CreateDropDown(
+    HWND hDlg, DropDown& dropDown, int controlId, int x, int y, int width, HFONT dialogFont)
+{
+    HMENU hmenu = reinterpret_cast<HMENU>(static_cast<UINT_PTR>(controlId));
+
+    // Static label above the combo box.
+    HWND label = CreateWindowEx(
+        0, L"STATIC", dropDown.label.c_str(), WS_VISIBLE | WS_CHILD, x, y, width,
+        kDropDownLabelHeight, hDlg, NULL, GetModuleHandle(NULL), NULL);
+    SetControlFont(label, dialogFont);
+
+    // Combo box — CBS_DROPDOWNLIST prevents typing, user must pick from list.
+    HWND comboBox = CreateWindowEx(
+        0, L"COMBOBOX", NULL, WS_VISIBLE | WS_CHILD | CBS_DROPDOWNLIST | WS_VSCROLL, x,
+        y + kDropDownLabelHeight + kLabelToInputSpacing, width, kDropDownHeight, hDlg, hmenu,
+        GetModuleHandle(NULL), NULL);
+    SetControlFont(comboBox, dialogFont);
+
+    for (const auto& option : dropDown.options)
+    {
+        SendMessage(comboBox, CB_ADDSTRING, 0, reinterpret_cast<LPARAM>(option.c_str()));
+    }
+    SendMessage(comboBox, CB_SETCURSEL, dropDown.selectedIndex, 0);
+
+    return kDropDownLabelHeight + kLabelToInputSpacing + kDropDownControlHeight;
 }
 
 // Dispatches to the appropriate creation helper based on the DialogControl
@@ -156,6 +189,10 @@ int CreateDynamicControl(
             {
                 return CreateTextArea(hDlg, ctrl, controlId, x, y, width, dialogFont);
             }
+            else if constexpr (std::is_same_v<T, DropDown>)
+            {
+                return CreateDropDown(hDlg, ctrl, controlId, x, y, width, dialogFont);
+            }
         },
         control);
 }
@@ -185,6 +222,21 @@ void CollectTextAreaValue(HWND hDlg, TextArea& textArea, int controlId)
     GetWindowText(ctrl, textArea.input.data(), len + 1);
 }
 
+// Reads the selected index from a combo box and updates the DropDown.
+// Leaves the existing |selectedIndex| unchanged if the combo box has no
+// current selection (CB_GETCURSEL returns CB_ERR).
+void CollectDropDownValue(HWND hDlg, DropDown& dropDown, int controlId)
+{
+    HWND ctrl = GetDlgItem(hDlg, controlId);
+    if (!ctrl)
+        return;
+    const LRESULT sel = SendMessage(ctrl, CB_GETCURSEL, 0, 0);
+    if (sel != CB_ERR)
+    {
+        dropDown.selectedIndex = static_cast<int>(sel);
+    }
+}
+
 } // namespace
 
 static INT_PTR CALLBACK DlgProcStatic(
@@ -380,6 +432,11 @@ void TextInputDialog::CollectControlValues(HWND hDlg)
                     CollectTextAreaValue(hDlg, control, controlId);
                     results.insert_or_assign(control.label, control);
                 }
+                else if constexpr (std::is_same_v<T, DropDown>)
+                {
+                    CollectDropDownValue(hDlg, control, controlId);
+                    results.insert_or_assign(control.label, control);
+                }
             },
             controls[i]);
     }
@@ -430,9 +487,17 @@ TextInputDialog::Builder& TextInputDialog::Builder::AddCheckBoxGroup(
 }
 
 TextInputDialog::Builder& TextInputDialog::Builder::AddTextArea(
-    const std::wstring& label, const std::wstring& input, bool readOnly)
+    const std::wstring& label, const std::wstring& input, bool readOnly, int labelHeight,
+    int inputHeight)
+{
+    m_controls.emplace_back(TextArea(label, input, readOnly, labelHeight, inputHeight));
+    return *this;
+}
+
+TextInputDialog::Builder& TextInputDialog::Builder::AddDropDown(
+    const std::wstring& label, std::vector<std::wstring> options, int selectedIndex)
 {
-    m_controls.emplace_back(TextArea(label, input, readOnly));
+    m_controls.emplace_back(DropDown(label, std::move(options), selectedIndex));
     return *this;
 }
 
diff --git a/SampleApps/WebView2APISample/TextInputDialog.h b/SampleApps/WebView2APISample/TextInputDialog.h
index f127de7..15cf187 100644
--- a/SampleApps/WebView2APISample/TextInputDialog.h
+++ b/SampleApps/WebView2APISample/TextInputDialog.h
@@ -14,6 +14,10 @@
 
 // Per-type structs for dynamically created dialog controls.
 
+// Default heights (in dialog units) for dynamic controls.
+inline constexpr int kLabelHeight = 100;
+inline constexpr int kTextAreaHeight = 120;
+
 // A single checkbox option within a group. Holds a display label, an integer
 // value returned to the caller when selected, and a flag indicating whether
 // the checkbox should be pre-checked when the dialog is shown.
@@ -62,15 +66,41 @@ struct TextArea
     bool readOnly;
     // Pre-filled with default text; holds the user-entered text after OK.
     std::wstring input;
+    // Height in pixels for the label and input areas.
+    int labelHeight;
+    int inputHeight;
+
+    TextArea(
+        const std::wstring& label, const std::wstring& input = L"", bool readOnly = false,
+        int labelHeight = kLabelHeight, int inputHeight = kTextAreaHeight)
+        : label(label), readOnly(readOnly), input(input), labelHeight(labelHeight),
+          inputHeight(inputHeight)
+    {
+    }
+};
 
-    TextArea(const std::wstring& label, const std::wstring& input = L"", bool readOnly = false)
-        : label(label), readOnly(readOnly), input(input)
+// A dropdown (combo box) control with a label above it.
+// After the dialog is dismissed, |selectedIndex| holds the index of the
+// user's selection.
+struct DropDown
+{
+    // Descriptive text shown above the combo box.
+    std::wstring label;
+    // The list of options to display in the dropdown.
+    std::vector<std::wstring> options;
+    // The index of the initially selected option. Updated to the user's
+    // selection after the dialog is dismissed.
+    int selectedIndex;
+
+    DropDown(
+        const std::wstring& label, std::vector<std::wstring> options, int selectedIndex = 0)
+        : label(label), options(std::move(options)), selectedIndex(selectedIndex)
     {
     }
 };
 
 // Ordered collection of dynamic controls. Add new types to this variant.
-using DialogControl = std::variant<CheckBoxGroup, TextArea>;
+using DialogControl = std::variant<CheckBoxGroup, TextArea, DropDown>;
 
 // Constructing this struct will show a text input dialog and return when the user
 // dismisses it.  If the user clicked the OK button, confirmed will be true and input will
@@ -88,7 +118,11 @@ struct TextInputDialog
         Builder& AddCheckBoxGroup(
             const std::wstring& groupLabel, std::vector<CheckBoxOption> options);
         Builder& AddTextArea(
-            const std::wstring& label, const std::wstring& input = L"", bool readOnly = false);
+            const std::wstring& label, const std::wstring& input = L"", bool readOnly = false,
+            int labelHeight = kLabelHeight, int inputHeight = kTextAreaHeight);
+        Builder& AddDropDown(
+            const std::wstring& label, std::vector<std::wstring> options,
+            int selectedIndex = 0);
         TextInputDialog Build();
 
     private:
diff --git a/SampleApps/WebView2APISample/WebView2APISample.rc b/SampleApps/WebView2APISample/WebView2APISample.rc
index 1150fff..3f86332 100644
--- a/SampleApps/WebView2APISample/WebView2APISample.rc
+++ b/SampleApps/WebView2APISample/WebView2APISample.rc
@@ -316,6 +316,11 @@ BEGIN
         MENUITEM "WebView Window Controls Overlay",       IDM_SCENARIO_WINDOW_CONTROLS_OVERLAY
 
         MENUITEM "Dropped file path",           IDM_SCENARIO_DROPPED_FILE_PATH
+        POPUP "Diagnostic Monitor"
+        BEGIN
+          MENUITEM "Create Monitor with Filter...", IDM_SCENARIO_DIAGNOSTIC_CREATE_MONITOR
+          MENUITEM "Clear All Monitors",            IDM_SCENARIO_DIAGNOSTIC_CLEAR_ALL
+        END
         POPUP "Save As"
         BEGIN
           MENUITEM "Toggle Silent Save As", IDM_SCENARIO_SAVE_AS_TOGGLE_SILENT
diff --git a/SampleApps/WebView2APISample/WebView2APISample.vcxproj b/SampleApps/WebView2APISample/WebView2APISample.vcxproj
index 9f58112..a12f2d8 100644
--- a/SampleApps/WebView2APISample/WebView2APISample.vcxproj
+++ b/SampleApps/WebView2APISample/WebView2APISample.vcxproj
@@ -237,6 +237,7 @@
     <ClInclude Include="ScenarioDedicatedWorker.h" />
     <ClInclude Include="ScenarioDedicatedWorkerPostMessage.h" />
     <ClInclude Include="ScenarioDefaultBackgroundColor.h" />
+    <ClInclude Include="ScenarioDiagnosticMonitor.h" />
     <ClInclude Include="ScenarioDOMContentLoaded.h" />
     <ClInclude Include="ScenarioDragDrop.h" />
     <ClInclude Include="ScenarioDragDropOverride.h" />
@@ -303,6 +304,7 @@
     <ClCompile Include="ScenarioDedicatedWorker.cpp" />
     <ClCompile Include="ScenarioDedicatedWorkerPostMessage.cpp" />
     <ClCompile Include="ScenarioDefaultBackgroundColor.cpp" />
+    <ClCompile Include="ScenarioDiagnosticMonitor.cpp" />
     <ClCompile Include="ScenarioDOMContentLoaded.cpp" />
     <ClCompile Include="ScenarioDragDrop.cpp" />
     <ClCompile Include="ScenarioDragDropOverride.cpp" />
@@ -536,13 +538,13 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
     <Import Project="..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets" Condition="Exists('..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets')" />
-    <Import Project="..\packages\Microsoft.Web.WebView2.1.0.4126-prerelease\build\native\Microsoft.Web.WebView2.targets" Condition="Exists('..\packages\Microsoft.Web.WebView2.1.0.4126-prerelease\build\native\Microsoft.Web.WebView2.targets')" />
+    <Import Project="..\packages\Microsoft.Web.WebView2.1.0.4181-prerelease\build\native\Microsoft.Web.WebView2.targets" Condition="Exists('..\packages\Microsoft.Web.WebView2.1.0.4181-prerelease\build\native\Microsoft.Web.WebView2.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
     <Error Condition="!Exists('..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Windows.ImplementationLibrary.1.0.220201.1\build\native\Microsoft.Windows.ImplementationLibrary.targets'))" />
-    <Error Condition="!Exists('..\packages\Microsoft.Web.WebView2.1.0.4126-prerelease\build\native\Microsoft.Web.WebView2.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Web.WebView2.1.0.4126-prerelease\build\native\Microsoft.Web.WebView2.targets'))" />
+    <Error Condition="!Exists('..\packages\Microsoft.Web.WebView2.1.0.4181-prerelease\build\native\Microsoft.Web.WebView2.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Web.WebView2.1.0.4181-prerelease\build\native\Microsoft.Web.WebView2.targets'))" />
   </Target>
 </Project>
diff --git a/SampleApps/WebView2APISample/packages.config b/SampleApps/WebView2APISample/packages.config
index e8c4a8d..bc68ded 100644
--- a/SampleApps/WebView2APISample/packages.config
+++ b/SampleApps/WebView2APISample/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Web.WebView2" version="1.0.4126-prerelease" targetFramework="native" />
+  <package id="Microsoft.Web.WebView2" version="1.0.4181-prerelease" targetFramework="native" />
   <package id="Microsoft.Windows.ImplementationLibrary" version="1.0.220201.1" targetFramework="native" />
 </packages>
\ No newline at end of file
diff --git a/SampleApps/WebView2APISample/resource.h b/SampleApps/WebView2APISample/resource.h
index 79a28dd..b96bde4 100644
--- a/SampleApps/WebView2APISample/resource.h
+++ b/SampleApps/WebView2APISample/resource.h
@@ -266,6 +266,8 @@
 #define ID_SETTINGS_TOGGLE_HIDE_PDF_TOOLBAR_ITEMS_RIGHT      32856
 #define ID_SETTINGS_TOGGLE_HIDE_PDF_TOOLBAR_ITEMS_ALL        32857
 #define IDM_SCENARIO_THROTTLING_CONTROL 32807
+#define IDM_SCENARIO_DIAGNOSTIC_CREATE_MONITOR 32810
+#define IDM_SCENARIO_DIAGNOSTIC_CLEAR_ALL 32811
 #define IDM_SCENARIO_SCREEN_CAPTURE 32809
 #define IDC_STATIC                      -1
 // Next default values for new objects
diff --git a/SampleApps/WebView2WindowsFormsBrowser/WebView2WindowsFormsBrowser.csproj b/SampleApps/WebView2WindowsFormsBrowser/WebView2WindowsFormsBrowser.csproj
index e2c217d..af3004a 100644
--- a/SampleApps/WebView2WindowsFormsBrowser/WebView2WindowsFormsBrowser.csproj
+++ b/SampleApps/WebView2WindowsFormsBrowser/WebView2WindowsFormsBrowser.csproj
@@ -25,7 +25,7 @@
     <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.4126-prerelease" />
+    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.4181-prerelease" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="assets\" />
diff --git a/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj b/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj
index c4b74ad..0f4263f 100644
--- a/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj
+++ b/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj
@@ -61,7 +61,7 @@
     </Content>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.4126-prerelease" />
+    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.4181-prerelease" />
 	<PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 </Project>