erikdarlingdata · erikdarlingdata · Apr 14, 2026 · Apr 14, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -5,6 +5,48 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.7.0] - 2026-04-13
+
+### Added
+
+- **Host OS column** in Server Inventory for both Dashboard and Lite ([#748], [#823])
+- **Offline community script support** via `community/` directory for user-contributed scripts ([#814], [#822])
+- **MultiSubnetFailover connection option** in Dashboard and Lite for Always On availability groups ([#813], [#821])
+
+### Changed
+
+- **PlanAnalyzer and ShowPlanParser** synced from PerformanceStudio with latest improvements ([#816])
+- **MCP query tools** optimized for large databases ([#826])
+- **Add Server dialog UX** improved with inline connection status and full-height window
+- **"CPUs" renamed to "Logical CPUs"** for clarity in Lite ([#825])
+
+### Fixed
+
+- **Dashboard auto-refresh stalling under load** — replaced DispatcherTimer with async Task.Delay loop to prevent priority starvation during heavy chart rendering ([#833], [#834])
+- **Lite auto-refresh silently skipping** every tick ([#824])
+- **Deadlock count not resetting** between collections ([#803], [#820])
+- **Upgrade filter skipping patch versions** during version comparison ([#817], [#819])
+- **Upgrade script executing against master** instead of PerformanceMonitor database ([#828])
+- **Duplicate release builds** triggering on both created and published events
+
+[#748]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/748
+[#803]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/803
+[#813]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/813
+[#814]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/814
+[#816]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/816
+[#817]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/817
+[#819]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/819
+[#820]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/820
+[#821]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/821
+[#822]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/822
+[#823]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/823
+[#824]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/824
+[#825]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/825
+[#826]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/826
+[#828]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/828
+[#833]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/833
+[#834]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/834
+
 ## [2.6.0] - 2026-04-08
 
 ### Added

diff --git a/Dashboard/Dashboard.csproj b/Dashboard/Dashboard.csproj
@@ -7,10 +7,10 @@
     <StartupObject>PerformanceMonitorDashboard.Program</StartupObject>
     <AssemblyName>PerformanceMonitorDashboard</AssemblyName>
     <Product>SQL Server Performance Monitor Dashboard</Product>
-    <Version>2.6.0</Version>
-    <AssemblyVersion>2.6.0.0</AssemblyVersion>
-    <FileVersion>2.6.0.0</FileVersion>
-    <InformationalVersion>2.6.0</InformationalVersion>
+    <Version>2.7.0</Version>
+    <AssemblyVersion>2.7.0.0</AssemblyVersion>
+    <FileVersion>2.7.0.0</FileVersion>
+    <InformationalVersion>2.7.0</InformationalVersion>
     <Company>Darling Data, LLC</Company>
     <Copyright>Copyright © 2026 Darling Data, LLC</Copyright>
     <ApplicationIcon>EDD.ico</ApplicationIcon>

diff --git a/Dashboard/ServerTab.xaml.cs b/Dashboard/ServerTab.xaml.cs
@@ -5,6 +5,7 @@
 using System.Windows.Data;
 using System.Text;
 using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
@@ -46,6 +47,7 @@ public partial class ServerTab : UserControl
 
         private readonly UserPreferencesService _preferencesService;
         private DispatcherTimer? _autoRefreshTimer;
+        private CancellationTokenSource? _autoRefreshCts;
         private bool _isRefreshing;
         private DateTime _refreshStartedUtc;
         private bool _suppressPickerUpdates;
@@ -127,7 +129,6 @@ public ServerTab(ServerConnection serverConnection, int utcOffsetMinutes = 0)
 
             InitializeDefaultTimeRanges();
             SetupChartContextMenus();
-            SetupAutoRefresh();
             SetupSubTabContextMenus();
 
             BlockingSlicer.RangeChanged += OnBlockingSlicerChanged;
@@ -343,42 +344,62 @@ private void SetupAutoRefresh()
 
             if (prefs.AutoRefreshEnabled)
             {
-                _autoRefreshTimer = new DispatcherTimer
-                {
-                    Interval = TimeSpan.FromSeconds(prefs.AutoRefreshIntervalSeconds)
-                };
-                _autoRefreshTimer.Tick += async (s, e) =>
+                StartAutoRefreshLoop(prefs.AutoRefreshIntervalSeconds);
+                AutoRefreshToggle.IsChecked = true;
+                AutoRefreshToggle.Content = $"Auto-Refresh: {prefs.AutoRefreshIntervalSeconds}s";
+            }
+            else
+            {
+                AutoRefreshToggle.IsChecked = false;
+                AutoRefreshToggle.Content = "Auto-Refresh: Off";
+            }
+        }
+
+        /// <summary>
+        /// Async loop that replaces DispatcherTimer for auto-refresh. Task.Delay is not
+        /// subject to Dispatcher priority starvation under heavy UI load (chart rendering,
+        /// data binding) that can indefinitely defer Background-priority DispatcherTimer ticks.
+        /// </summary>
+        private async void StartAutoRefreshLoop(int intervalSeconds)
+        {
+            if (_autoRefreshCts != null && !_autoRefreshCts.IsCancellationRequested)
+                return;
+
+            _autoRefreshCts?.Cancel();
+            var cts = new CancellationTokenSource();
+            _autoRefreshCts = cts;
+
+            try
+            {
+                while (!cts.Token.IsCancellationRequested)
                 {
-                    _autoRefreshTimer?.Stop();
+                    await Task.Delay(TimeSpan.FromSeconds(intervalSeconds), cts.Token);
+                    if (cts.Token.IsCancellationRequested) break;
+
                     try
                     {
+                        var sw = System.Diagnostics.Stopwatch.StartNew();
                         await RefreshVisibleTabAsync();
                         StatusText.Text = "Ready";
                         FooterText.Text = $"Last refresh: {DateTime.Now:yyyy-MM-dd HH:mm:ss} | Server: {_serverConnection.DisplayName}";
+                        Logger.Info($"Auto-refresh completed in {sw.ElapsedMilliseconds}ms for {_serverConnection.DisplayName}");
                     }
-                    catch (Exception ex)
+                    catch (Exception ex) when (ex is not OperationCanceledException)
                     {
                         Logger.Error($"Auto-refresh error: {ex.Message}", ex);
                         StatusText.Text = "Auto-refresh error";
                     }
-                    finally
-                    {
-                        _autoRefreshTimer?.Start();
-                    }
-                };
-                _autoRefreshTimer.Start();
-                AutoRefreshToggle.IsChecked = true;
-                AutoRefreshToggle.Content = $"Auto-Refresh: {prefs.AutoRefreshIntervalSeconds}s";
+                }
             }
-            else
+            catch (OperationCanceledException)
             {
-                AutoRefreshToggle.IsChecked = false;
-                AutoRefreshToggle.Content = "Auto-Refresh: Off";
+                // Normal shutdown
             }
         }
 
         private void ServerTab_Unloaded(object sender, RoutedEventArgs e)
         {
+            _autoRefreshCts?.Cancel();
             _autoRefreshTimer?.Stop();
             _autoRefreshTimer = null;
 
@@ -448,7 +469,9 @@ private void OnThemeChanged(string _)
 
         public void RefreshAutoRefreshSettings()
         {
-            // Stop existing timer
+            // Stop existing loop and timer
+            _autoRefreshCts?.Cancel();
+            _autoRefreshCts = null;
             _autoRefreshTimer?.Stop();
             _autoRefreshTimer = null;
 
@@ -457,30 +480,7 @@ public void RefreshAutoRefreshSettings()
 
             if (prefs.AutoRefreshEnabled)
             {
-                _autoRefreshTimer = new DispatcherTimer
-                {
-                    Interval = TimeSpan.FromSeconds(prefs.AutoRefreshIntervalSeconds)
-                };
-                _autoRefreshTimer.Tick += async (s, e) =>
-                {
-                    _autoRefreshTimer?.Stop();
-                    try
-                    {
-                        await RefreshVisibleTabAsync();
-                        StatusText.Text = "Ready";
-                        FooterText.Text = $"Last refresh: {DateTime.Now:yyyy-MM-dd HH:mm:ss} | Server: {_serverConnection.DisplayName}";
-                    }
-                    catch (Exception ex)
-                    {
-                        Logger.Error($"Auto-refresh error: {ex.Message}", ex);
-                        StatusText.Text = "Auto-refresh error";
-                    }
-                    finally
-                    {
-                        _autoRefreshTimer?.Start();
-                    }
-                };
-                _autoRefreshTimer.Start();
+                StartAutoRefreshLoop(prefs.AutoRefreshIntervalSeconds);
                 AutoRefreshToggle.IsChecked = true;
                 AutoRefreshToggle.Content = $"Auto-Refresh: {prefs.AutoRefreshIntervalSeconds}s";
             }
@@ -506,30 +506,7 @@ private void AutoRefreshToggle_Click(object sender, RoutedEventArgs e)
                 prefs.AutoRefreshEnabled = true;
                 _preferencesService.SavePreferences(prefs);
 
-                _autoRefreshTimer = new DispatcherTimer
-                {
-                    Interval = TimeSpan.FromSeconds(prefs.AutoRefreshIntervalSeconds)
-                };
-                _autoRefreshTimer.Tick += async (s, args) =>
-                {
-                    _autoRefreshTimer?.Stop();
-                    try
-                    {
-                        await RefreshVisibleTabAsync();
-                        StatusText.Text = "Ready";
-                        FooterText.Text = $"Last refresh: {DateTime.Now:yyyy-MM-dd HH:mm:ss} | Server: {_serverConnection.DisplayName}";
-                    }
-                    catch (Exception ex)
-                    {
-                        Logger.Error($"Auto-refresh error: {ex.Message}", ex);
-                        StatusText.Text = "Auto-refresh error";
-                    }
-                    finally
-                    {
-                        _autoRefreshTimer?.Start();
-                    }
-                };
-                _autoRefreshTimer.Start();
+                StartAutoRefreshLoop(prefs.AutoRefreshIntervalSeconds);
                 AutoRefreshToggle.Content = $"Auto-Refresh: {prefs.AutoRefreshIntervalSeconds}s";
             }
             else
@@ -538,8 +515,7 @@ private void AutoRefreshToggle_Click(object sender, RoutedEventArgs e)
                 prefs.AutoRefreshEnabled = false;
                 _preferencesService.SavePreferences(prefs);
 
-                _autoRefreshTimer?.Stop();
-                _autoRefreshTimer = null;
+                _autoRefreshCts?.Cancel();
                 AutoRefreshToggle.Content = "Auto-Refresh: Off";
             }
         }
@@ -643,6 +619,7 @@ private async void ServerTab_Loaded(object sender, RoutedEventArgs e)
                 DefaultTraceTab.SetTimeRange(_globalHoursBack, _globalFromDate, _globalToDate);
 
                 await LoadDataAsync();
+                SetupAutoRefresh();
             }
             catch (Exception ex)
             {

diff --git a/Installer.Core/Installer.Core.csproj b/Installer.Core/Installer.Core.csproj
@@ -7,10 +7,10 @@
     <RootNamespace>Installer.Core</RootNamespace>
     <AssemblyName>Installer.Core</AssemblyName>
     <Product>SQL Server Performance Monitor Installer Core</Product>
-    <Version>2.6.0</Version>
-    <AssemblyVersion>2.6.0.0</AssemblyVersion>
-    <FileVersion>2.6.0.0</FileVersion>
-    <InformationalVersion>2.6.0</InformationalVersion>
+    <Version>2.7.0</Version>
+    <AssemblyVersion>2.7.0.0</AssemblyVersion>
+    <FileVersion>2.7.0.0</FileVersion>
+    <InformationalVersion>2.7.0</InformationalVersion>
     <Company>Darling Data, LLC</Company>
     <Copyright>Copyright (c) 2026 Darling Data, LLC</Copyright>
     <EnableNETAnalyzers>true</EnableNETAnalyzers>

diff --git a/Installer/PerformanceMonitorInstaller.csproj b/Installer/PerformanceMonitorInstaller.csproj
@@ -20,10 +20,10 @@
     <!-- Application metadata -->
     <AssemblyName>PerformanceMonitorInstaller</AssemblyName>
     <Product>SQL Server Performance Monitor Installer</Product>
-    <Version>2.6.0</Version>
-    <AssemblyVersion>2.6.0.0</AssemblyVersion>
-    <FileVersion>2.6.0.0</FileVersion>
-    <InformationalVersion>2.6.0</InformationalVersion>
+    <Version>2.7.0</Version>
+    <AssemblyVersion>2.7.0.0</AssemblyVersion>
+    <FileVersion>2.7.0.0</FileVersion>
+    <InformationalVersion>2.7.0</InformationalVersion>
     <Company>Darling Data, LLC</Company>
     <Copyright>Copyright © 2026 Darling Data, LLC</Copyright>
     <Description>Installation utility for SQL Server Performance Monitor - Supports SQL Server 2016-2025</Description>

diff --git a/Lite/PerformanceMonitorLite.csproj b/Lite/PerformanceMonitorLite.csproj
@@ -8,10 +8,10 @@
     <AssemblyName>PerformanceMonitorLite</AssemblyName>
     <RootNamespace>PerformanceMonitorLite</RootNamespace>
     <Product>SQL Server Performance Monitor Lite</Product>
-    <Version>2.6.0</Version>
-    <AssemblyVersion>2.6.0.0</AssemblyVersion>
-    <FileVersion>2.6.0.0</FileVersion>
-    <InformationalVersion>2.6.0</InformationalVersion>
+    <Version>2.7.0</Version>
+    <AssemblyVersion>2.7.0.0</AssemblyVersion>
+    <FileVersion>2.7.0.0</FileVersion>
+    <InformationalVersion>2.7.0</InformationalVersion>
     <Company>Darling Data, LLC</Company>
     <Copyright>Copyright © 2026 Darling Data, LLC</Copyright>
     <Description>Lightweight SQL Server performance monitoring - no installation required on target servers</Description>

diff --git a/README.md b/README.md
@@ -99,7 +99,7 @@ Data starts flowing within 1–5 minutes. That's it. No installation on your ser
 
 **Upgrading from zip?** Click **Import Settings** then **Import Data** in the sidebar and point both at your old Lite folder. Settings imports server connections, alert thresholds, SMTP config, and schedules. Data imports historical DuckDB + Parquet archives. **Auto-update users** (installed via Setup.exe) get updates automatically — no manual import needed.
 
-**Always On AG?** Enable **ReadOnlyIntent** in the connection settings to route Lite's monitoring queries to a readable secondary, keeping the primary clear.
+**Always On AG?** Enable **ReadOnlyIntent** in the connection settings to route Lite's monitoring queries to a readable secondary, keeping the primary clear. Enable **MultiSubnetFailover** for multi-subnet failover scenarios.
 
 ### Lite Collectors
 
@@ -191,6 +191,8 @@ PerformanceMonitorInstaller.exe YourServerName sa YourPassword --uninstall
 
 The installer automatically tests the connection, checks the SQL Server version (2016+ required), executes SQL scripts, downloads community dependencies, creates SQL Agent jobs, and runs initial data collection. You can also install directly from the Dashboard's Add Server dialog.
 
+**Air-gapped environments?** Place pre-downloaded community scripts (`sp_WhoIsActive.sql`, `DarlingData.sql`, `Install-All-Scripts.sql`) in a `community/` directory next to the installer. The installer uses local files when present and falls back to GitHub downloads otherwise.
+
 ### CLI Installer Options
 
 | Option | Description |