From ed235d6e6d40fa56180c4379fa7d0b018f3aa0cc Mon Sep 17 00:00:00 2001
From: Erik Darling <2136037+erikdarlingdata@users.noreply.github.com>
Date: Sun, 15 Mar 2026 21:56:26 -0400
Subject: [PATCH] Send email alerts when monitored servers go offline/online
 (#529)
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The existing NotifyOnConnectionLost/Restored settings only sent tray
notifications. Now also sends an email (if SMTP is configured) on the
online→offline transition and a "Server Restored" email when it comes
back. Fires exactly once per transition — no repeated alerts while
the server stays down.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 Dashboard/MainWindow.xaml.cs               | 19 +++++++++++++++++++
 Dashboard/Services/EmailTemplateBuilder.cs |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/Dashboard/MainWindow.xaml.cs b/Dashboard/MainWindow.xaml.cs
index 44a66a60..8d67436b 100644
--- a/Dashboard/MainWindow.xaml.cs
+++ b/Dashboard/MainWindow.xaml.cs
@@ -423,10 +423,29 @@ private async System.Threading.Tasks.Task CheckAllConnectionsAsync()
                             _notificationService?.ShowServerOfflineNotification(
                                 item.DisplayName,
                                 newStatus.ErrorMessage);
+
+                            var errorDetail = newStatus.ErrorMessage ?? "Connection failed";
+                            _emailAlertService.RecordAlert(item.Id, item.DisplayName, "Server Unreachable",
+                                errorDetail, "Online", true, "email");
+                            _ = _emailAlertService.TrySendAlertEmailAsync(
+                                "Server Unreachable",
+                                item.DisplayName,
+                                errorDetail,
+                                "Online",
+                                item.Id);
                         }
                         else if (!wasOnline && isOnline && prefs.NotifyOnConnectionRestored)
                         {
                             _notificationService?.ShowConnectionRestoredNotification(item.DisplayName);
+
+                            _emailAlertService.RecordAlert(item.Id, item.DisplayName, "Server Restored",
+                                "Online", "Online", true, "email");
+                            _ = _emailAlertService.TrySendAlertEmailAsync(
+                                "Server Restored",
+                                item.DisplayName,
+                                "Connection restored",
+                                "Online",
+                                item.Id);
                         }
                     }
 
diff --git a/Dashboard/Services/EmailTemplateBuilder.cs b/Dashboard/Services/EmailTemplateBuilder.cs
index 87387439..c2b9efbb 100644
--- a/Dashboard/Services/EmailTemplateBuilder.cs
+++ b/Dashboard/Services/EmailTemplateBuilder.cs
@@ -74,6 +74,8 @@ private static (string AccentColor, string BadgeText) GetSeverity(string metricN
                 "Long-Running Query" => ("#D97706", "WARNING"),
                 "TempDB Space" => ("#D97706", "WARNING"),
                 "Long-Running Job" => ("#D97706", "WARNING"),
+                "Server Unreachable" => ("#DC2626", "CRITICAL"),
+                "Server Restored" => ("#16A34A", "RESOLVED"),
                 _ => ("#2eaef1", "INFO")
             };
         }