ApiDto/Requests/Configuration/LoggingRequest.cs

@@ -22,4 +22,17 @@ public class LoggingRequest
     /// Gets or sets the log file path.
     /// </summary>
     public string? LogFilePath { get; set; }
+
+    /// <summary>
+    /// Gets or sets the API key for integrating with Seq, a log aggregation service.
+    /// If provided, logs will be sent to a Seq server using this API key.
+    /// </summary>
+    public string? ApiKeySeq { get; set; }
+
+    /// <summary>
+    /// Gets or sets the server URL for the Seq logging service.
+    /// This property specifies the Seq server endpoint to which logs will be sent.
+    /// If <see cref="ApiKeySeq"/> is provided, logs will be sent to this server.
+    /// </summary>
+    public string? ApiServerSeq { get; set; }
 }

Endpoint/Configuration/Core/Middleware/MaintenanceModeMiddleware.cs

@@ -24,7 +24,6 @@ public class MaintenanceModeMiddleware(RequestDelegate next, IMaintenanceModeSer
             context.Response.StatusCode = StatusCodes.Status503ServiceUnavailable;
             context.Response.ContentType = "plain/text";
 
-            string error;
             if (maintenanceModeService.IsMaintenanceMode)
                 throw new ServerUnavailableException("The service is currently undergoing maintenance. Please try again later.", true);
 

Endpoint/Configuration/Core/Startup/LoggerConfiguration.cs

@@ -45,6 +45,12 @@ public static class LoggerConfiguration
                     rollingInterval: RollingInterval.Day);
             }
 
+#if !DEBUG
+            if (generalConfig != null && !string.IsNullOrEmpty(generalConfig.ApiServerSeq) &&
+                Uri.TryCreate(generalConfig.ApiServerSeq, UriKind.Absolute, out var _))
+                configuration.WriteTo.Seq(generalConfig.ApiServerSeq, apiKey: generalConfig.ApiKeySeq);
+#endif
+
             configuration
                 .MinimumLevel.Override("Microsoft.AspNetCore.Hosting", LogEventLevel.Warning)
                 .MinimumLevel.Override("Microsoft.AspNetCore.Mvc", LogEventLevel.Warning)

Endpoint/Configuration/Model/GeneralSettings/LogSettings.cs

@@ -9,6 +9,8 @@ public class LogSettings : IIsConfigured
     public bool EnableLogToFile { get; set; }
     public string? LogFilePath { get; set; }
     public string? LogFileName { get; set; }
+    public string? ApiKeySeq { get; set; }
+    public string? ApiServerSeq { get; set; }
 
     public bool IsConfigured()
     {

Endpoint/Controllers/Configuration/SetupController.cs

@@ -22,6 +22,7 @@ using Mirea.Api.Security.Common.Domain;
 using Mirea.Api.Security.Services;
 using MySqlConnector;
 using Npgsql;
+using Serilog;
 using StackExchange.Redis;
 using System;
 using System.Collections.Generic;
@@ -408,6 +409,29 @@ public class SetupController(
             }
         };
 
+        if (!string.IsNullOrEmpty(request?.ApiServerSeq))
+        {
+            settings.ApiServerSeq = request.ApiServerSeq;
+            settings.ApiKeySeq = request.ApiKeySeq;
+
+            try
+            {
+                Log.Logger = new LoggerConfiguration()
+                    .WriteTo.Seq(settings.ApiServerSeq, apiKey: settings.ApiKeySeq)
+                    .CreateLogger();
+
+                Log.Warning("Testing configuration Seq.");
+            }
+            catch
+            {
+                // ignoring
+            }
+            finally
+            {
+                Log.CloseAndFlush();
+            }
+        }
+
         if (settings.EnableLogToFile)
         {
             if (string.IsNullOrEmpty(settings.LogFileName))
@@ -427,7 +451,9 @@ public class SetupController(
         {
             EnableLogToFile = settings.EnableLogToFile,
             LogFileName = settings.LogFileName,
-            LogFilePath = settings.LogFilePath
+            LogFilePath = settings.LogFilePath,
+            ApiKeySeq = settings.ApiKeySeq,
+            ApiServerSeq = settings.ApiServerSeq
         });
 
         return true;

Endpoint/Endpoint.csproj

@@ -50,6 +50,7 @@
 		<PackageReference Include="Serilog.Sinks.Debug" Version="3.0.0" />
 		<PackageReference Include="Serilog.Sinks.File" Version="6.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Caching.StackExchangeRedis" Version="8.0.11" />
+		<PackageReference Include="Serilog.Sinks.Seq" Version="8.0.0" />
 		<PackageReference Include="StackExchange.Redis" Version="2.8.24" />
 		<PackageReference Include="Swashbuckle.AspNetCore" Version="7.2.0" />
 		<PackageReference Include="System.CodeDom" Version="[8.0.0, 9.0.0)" />