Feature/alert muting

Dashboard/AlertDetailWindow.xaml

@@ -0,0 +1,99 @@
+<Window x:Class="PerformanceMonitorDashboard.AlertDetailWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="Alert Details"
+        Width="480" SizeToContent="Height"
+        WindowStartupLocation="CenterOwner"
+        ResizeMode="NoResize"
+        Icon="/EDD.ico"
+        Background="{DynamicResource BackgroundBrush}">
+    <Grid Margin="20">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+
+        <!-- Header -->
+        <TextBlock Grid.Row="0" Text="Alert Details" FontSize="16" FontWeight="SemiBold"
+                   Foreground="{DynamicResource ForegroundBrush}" Margin="0,0,0,16"/>
+
+        <!-- Detail fields -->
+        <Grid Grid.Row="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="130"/>
+                <ColumnDefinition Width="*"/>
+            </Grid.ColumnDefinitions>
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+            </Grid.RowDefinitions>
+
+            <TextBlock Grid.Row="0" Grid.Column="0" Text="Time:" FontWeight="SemiBold"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4"/>
+            <TextBlock Grid.Row="0" Grid.Column="1" x:Name="TimeText"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4" TextWrapping="Wrap"/>
+
+            <TextBlock Grid.Row="1" Grid.Column="0" Text="Server:" FontWeight="SemiBold"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4"/>
+            <TextBlock Grid.Row="1" Grid.Column="1" x:Name="ServerText"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4" TextWrapping="Wrap"/>
+
+            <TextBlock Grid.Row="2" Grid.Column="0" Text="Metric:" FontWeight="SemiBold"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4"/>
+            <TextBlock Grid.Row="2" Grid.Column="1" x:Name="MetricText"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4" TextWrapping="Wrap"/>
+
+            <TextBlock Grid.Row="3" Grid.Column="0" Text="Current Value:" FontWeight="SemiBold"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4"/>
+            <TextBlock Grid.Row="3" Grid.Column="1" x:Name="CurrentValueText"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4" TextWrapping="Wrap"/>
+
+            <TextBlock Grid.Row="4" Grid.Column="0" Text="Threshold:" FontWeight="SemiBold"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4"/>
+            <TextBlock Grid.Row="4" Grid.Column="1" x:Name="ThresholdText"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4" TextWrapping="Wrap"/>
+
+            <TextBlock Grid.Row="5" Grid.Column="0" Text="Notification:" FontWeight="SemiBold"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4"/>
+            <TextBlock Grid.Row="5" Grid.Column="1" x:Name="NotificationText"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4" TextWrapping="Wrap"/>
+
+            <TextBlock Grid.Row="6" Grid.Column="0" Text="Status:" FontWeight="SemiBold"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4"/>
+            <TextBlock Grid.Row="6" Grid.Column="1" x:Name="StatusText"
+                       Foreground="{DynamicResource ForegroundBrush}" Margin="0,4" TextWrapping="Wrap"/>
+        </Grid>
+
+        <!-- Muted indicator -->
+        <Border Grid.Row="2" x:Name="MutedBanner" Visibility="Collapsed"
+                CornerRadius="4" Padding="8" Margin="0,12,0,0">
+            <Border.Background>
+                <SolidColorBrush Color="{StaticResource WarningColor}" Opacity="0.2"/>
+            </Border.Background>
+            <TextBlock Text="🔇 This alert was muted by a mute rule"
+                       Foreground="{DynamicResource ForegroundBrush}" FontStyle="Italic"/>
+        </Border>
+
+        <!-- Context-specific details -->
+        <Border Grid.Row="3" x:Name="DetailPanel" Visibility="Collapsed"
+                Background="{DynamicResource BackgroundBrush}" BorderBrush="{DynamicResource BorderBrush}"
+                BorderThickness="1" CornerRadius="4" Padding="10" Margin="0,12,0,0">
+            <StackPanel>
+                <TextBlock Text="Details" FontWeight="SemiBold" FontSize="13"
+                           Foreground="{DynamicResource ForegroundBrush}" Margin="0,0,0,6"/>
+                <TextBox x:Name="DetailTextBox" IsReadOnly="True" TextWrapping="Wrap"
+                         Background="Transparent" BorderThickness="0"
+                         Foreground="{DynamicResource ForegroundBrush}" FontFamily="Consolas"
+                         FontSize="12" MaxHeight="300"
+                         VerticalScrollBarVisibility="Auto"/>
+            </StackPanel>
+        </Border>
+    </Grid>
+</Window>

Dashboard/AlertDetailWindow.xaml.cs

@@ -0,0 +1,36 @@
+/*
+ * Performance Monitor Dashboard
+ * Copyright (c) 2026 Darling Data, LLC
+ * Licensed under the MIT License - see LICENSE file for details
+ */
+
+using System.Windows;
+using PerformanceMonitorDashboard.Controls;
+
+namespace PerformanceMonitorDashboard
+{
+    public partial class AlertDetailWindow : Window
+    {
+        public AlertDetailWindow(AlertHistoryDisplayItem item)
+        {
+            InitializeComponent();
+
+            TimeText.Text = item.TimeLocal;
+            ServerText.Text = item.ServerName;
+            MetricText.Text = item.MetricName;
+            CurrentValueText.Text = item.CurrentValue;
+            ThresholdText.Text = item.ThresholdValue;
+            NotificationText.Text = item.NotificationType;
+            StatusText.Text = item.StatusDisplay;
+
+            if (item.Muted)
+                MutedBanner.Visibility = Visibility.Visible;
+
+            if (!string.IsNullOrWhiteSpace(item.DetailText))
+            {
+                DetailTextBox.Text = item.DetailText;
+                DetailPanel.Visibility = Visibility.Visible;
+            }
+        }
+    }
+}

Dashboard/Controls/AlertsHistoryContent.xaml

@@ -9,6 +9,10 @@
         <ResourceDictionary>
             <!-- Context Menu for DataGrid Copy/Export -->
             <ContextMenu x:Key="DataGridContextMenu">
+                <MenuItem Header="View Details..." Click="ViewAlertDetails_Click">
+                    <MenuItem.Icon><TextBlock Text="&#x1F50D;"/></MenuItem.Icon>
+                </MenuItem>
+                <Separator/>
                 <MenuItem Header="Copy Cell" Click="CopyCell_Click">
                     <MenuItem.Icon><TextBlock Text="&#x1F4CB;"/></MenuItem.Icon>
                 </MenuItem>
@@ -22,6 +26,13 @@
                 <MenuItem Header="Export to CSV..." Click="ExportToCsv_Click">
                     <MenuItem.Icon><TextBlock Text="&#x1F4CA;"/></MenuItem.Icon>
                 </MenuItem>
+                <Separator/>
+                <MenuItem Header="Mute This Alert..." Click="MuteThisAlert_Click">
+                    <MenuItem.Icon><TextBlock Text="&#x1F515;"/></MenuItem.Icon>
+                </MenuItem>
+                <MenuItem Header="Mute Similar Alerts..." Click="MuteSimilarAlerts_Click">
+                    <MenuItem.Icon><TextBlock Text="&#x1F507;"/></MenuItem.Icon>
+                </MenuItem>
             </ContextMenu>
 
             <Style x:Key="DefaultRowStyle" TargetType="DataGridRow">
@@ -39,6 +50,10 @@
                     <DataTrigger Binding="{Binding IsResolved}" Value="True">
                         <Setter Property="Background" Value="#3322C55E"/>
                     </DataTrigger>
+                    <DataTrigger Binding="{Binding Muted}" Value="True">
+                        <Setter Property="Opacity" Value="0.5"/>
+                        <Setter Property="FontStyle" Value="Italic"/>
+                    </DataTrigger>
                 </Style.Triggers>
             </Style>
         </ResourceDictionary>
@@ -89,6 +104,7 @@
                       CanUserResizeColumns="True"
                       SelectionMode="Extended"
                       SelectionChanged="AlertsDataGrid_SelectionChanged"
+                      MouseDoubleClick="AlertsDataGrid_MouseDoubleClick"
                       RowStyle="{StaticResource AlertRowStyle}">
                 <DataGrid.Columns>
                     <DataGridTextColumn Binding="{Binding TimeLocal}" Width="150">

Dashboard/Controls/AlertsHistoryContent.xaml.cs

@@ -25,6 +25,8 @@ public partial class AlertsHistoryContent : UserControl
     {
         public event EventHandler? AlertsDismissed;
 
+        public MuteRuleService? MuteRuleService { get; set; }
+
         private List<AlertHistoryDisplayItem> _allAlerts = new();
 
         /* Column filter state */
@@ -71,7 +73,9 @@ private void LoadAlerts()
                 IsResolved = e.MetricName.Contains("Cleared") || e.MetricName.Contains("Resolved"),
                 IsCritical = e.MetricName.Contains("Deadlock") || e.MetricName.Contains("Poison"),
                 IsWarning = !e.MetricName.Contains("Cleared") && !e.MetricName.Contains("Resolved")
-                            && !e.MetricName.Contains("Deadlock") && !e.MetricName.Contains("Poison")
+                            && !e.MetricName.Contains("Deadlock") && !e.MetricName.Contains("Poison"),
+                Muted = e.Muted,
+                DetailText = e.DetailText
             }).ToList();
 
             ApplyFilters();
@@ -432,6 +436,86 @@ private void ExportToCsv_Click(object sender, RoutedEventArgs e)
         }
 
         #endregion
+
+        #region Mute Handlers
+
+        private void AlertsDataGrid_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
+        {
+            if (sender is not DataGrid) return;
+
+            // Walk up the visual tree from the click target to find the DataGridRow
+            var source = e.OriginalSource as DependencyObject;
+            while (source != null && source is not DataGridRow && source is not DataGridColumnHeader)
+                source = System.Windows.Media.VisualTreeHelper.GetParent(source);
+
+            // Ignore clicks on column headers or outside rows
+            if (source is not DataGridRow row) return;
+            if (row.DataContext is not AlertHistoryDisplayItem item) return;
+
+            var owner = Window.GetWindow(this);
+            var detailWindow = new AlertDetailWindow(item);
+            if (owner != null) detailWindow.Owner = owner;
+            detailWindow.ShowDialog();
+        }
+
+        private void ViewAlertDetails_Click(object sender, RoutedEventArgs e)
+        {
+            if (sender is not MenuItem menuItem) return;
+            var contextMenu = menuItem.Parent as ContextMenu;
+            if (contextMenu == null) return;
+            var dataGrid = TabHelpers.FindDataGridFromContextMenu(contextMenu);
+            if (dataGrid?.SelectedItem is not AlertHistoryDisplayItem item) return;
+
+            var detailWindow = new AlertDetailWindow(item) { Owner = Window.GetWindow(this) };
+            detailWindow.ShowDialog();
+        }
+
+        private void MuteThisAlert_Click(object sender, RoutedEventArgs e)
+        {
+            if (MuteRuleService == null) return;
+            if (sender is not MenuItem menuItem) return;
+            var contextMenu = menuItem.Parent as ContextMenu;
+            if (contextMenu == null) return;
+            var dataGrid = TabHelpers.FindDataGridFromContextMenu(contextMenu);
+            if (dataGrid?.SelectedItem is not AlertHistoryDisplayItem item) return;
+
+            var context = new AlertMuteContext
+            {
+                ServerName = item.ServerName,
+                MetricName = item.MetricName
+            };
+
+            var dialog = new MuteRuleDialog(context) { Owner = Window.GetWindow(this) };
+            if (dialog.ShowDialog() == true)
+            {
+                MuteRuleService.AddRule(dialog.Rule);
+                LoadAlerts();
+            }
+        }
+
+        private void MuteSimilarAlerts_Click(object sender, RoutedEventArgs e)
+        {
+            if (MuteRuleService == null) return;
+            if (sender is not MenuItem menuItem) return;
+            var contextMenu = menuItem.Parent as ContextMenu;
+            if (contextMenu == null) return;
+            var dataGrid = TabHelpers.FindDataGridFromContextMenu(contextMenu);
+            if (dataGrid?.SelectedItem is not AlertHistoryDisplayItem item) return;
+
+            var context = new AlertMuteContext
+            {
+                MetricName = item.MetricName
+            };
+
+            var dialog = new MuteRuleDialog(context) { Owner = Window.GetWindow(this) };
+            if (dialog.ShowDialog() == true)
+            {
+                MuteRuleService.AddRule(dialog.Rule);
+                LoadAlerts();
+            }
+        }
+
+        #endregion
     }
 
     public class AlertHistoryDisplayItem
@@ -447,5 +531,7 @@ public class AlertHistoryDisplayItem
         public bool IsResolved { get; set; }
         public bool IsCritical { get; set; }
         public bool IsWarning { get; set; }
+        public bool Muted { get; set; }
+        public string? DetailText { get; set; }
     }
 }