Obsolete legacy TraceConfiguration in favor of ITelemetryContext

Applications/ConsoleReferenceClient/Program.cs

@@ -325,6 +325,7 @@ public static async Task Main(string[] args)
                 // override logfile
                 if (logFile != null)
                 {
+#pragma warning disable CS0618 // Type or member is obsolete
                     string logFilePath = config.TraceConfiguration.OutputFilePath;
                     string filename = Path.GetFileNameWithoutExtension(logFilePath);
                     config.TraceConfiguration.OutputFilePath = logFilePath.Replace(
@@ -333,7 +334,6 @@ public static async Task Main(string[] args)
                         StringComparison.Ordinal
                     );
                     config.TraceConfiguration.DeleteOnLoad = true;
-#pragma warning disable CS0618 // Type or member is obsolete
                     config.TraceConfiguration.ApplySettings();
 #pragma warning restore CS0618 // Type or member is obsolete
                 }

Applications/ConsoleReferenceServer/ConsoleUtils.cs

@@ -149,7 +149,9 @@ public void ConfigureLogging(
             LogLevel fileLevel = LogLevel.Information;
 
             // switch for Trace/Verbose output
+#pragma warning disable CS0618 // Type or member is obsolete
             int traceMasks = configuration.TraceConfiguration.TraceMasks;
+#pragma warning restore CS0618 // Type or member is obsolete
             if ((traceMasks &
                 ~(
                     Utils.TraceMasks.Information |
@@ -165,7 +167,9 @@ public void ConfigureLogging(
             // add file logging if configured
             if (logFile)
             {
+#pragma warning disable CS0618 // Type or member is obsolete
                 string outputFilePath = configuration.TraceConfiguration.OutputFilePath;
+#pragma warning restore CS0618 // Type or member is obsolete
                 if (!string.IsNullOrWhiteSpace(outputFilePath))
                 {
                     loggerConfiguration.WriteTo.File(

Applications/ConsoleReferenceServer/Program.cs

@@ -137,13 +137,15 @@ public static async Task<int> Main(string[] args)
                 if (shadowConfig)
                 {
                     Console.WriteLine("Using shadow configuration.");
+#pragma warning disable CS0618 // Type or member is obsolete
                     string shadowPath = Directory
                         .GetParent(
                             Path.GetDirectoryName(
                                 Utils.ReplaceSpecialFolderNames(server.Configuration.TraceConfiguration.OutputFilePath)
                             )
                         )
                         .FullName;
+#pragma warning restore CS0618 // Type or member is obsolete
                     string shadowFilePath = Path.Combine(
                         shadowPath,
                         Path.GetFileName(server.Configuration.SourceFilePath)

Libraries/Opc.Ua.Configuration/ApplicationConfigurationBuilder.cs

@@ -1081,21 +1081,27 @@ public IApplicationConfigurationBuilderClientOptions SetClientOperationLimits(
         public IApplicationConfigurationBuilderTraceConfiguration SetOutputFilePath(
             string outputFilePath)
         {
+#pragma warning disable CS0618 // Type or member is obsolete
             ApplicationConfiguration.TraceConfiguration.OutputFilePath = outputFilePath;
+#pragma warning restore CS0618 // Type or member is obsolete
             return this;
         }
 
         /// <inheritdoc/>
         public IApplicationConfigurationBuilderTraceConfiguration SetDeleteOnLoad(bool deleteOnLoad)
         {
+#pragma warning disable CS0618 // Type or member is obsolete
             ApplicationConfiguration.TraceConfiguration.DeleteOnLoad = deleteOnLoad;
+#pragma warning restore CS0618 // Type or member is obsolete
             return this;
         }
 
         /// <inheritdoc/>
         public IApplicationConfigurationBuilderTraceConfiguration SetTraceMasks(int traceMasks)
         {
+#pragma warning disable CS0618 // Type or member is obsolete
             ApplicationConfiguration.TraceConfiguration.TraceMasks = traceMasks;
+#pragma warning restore CS0618 // Type or member is obsolete
             return this;
         }
 

Libraries/Opc.Ua.Configuration/ApplicationInstance.cs

@@ -248,7 +248,9 @@ public IApplicationConfigurationBuilderTypes Build(string applicationUri, string
                 ApplicationType = ApplicationType,
                 ApplicationUri = applicationUri,
                 ProductUri = productUri,
+#pragma warning disable CS0618 // Type or member is obsolete
                 TraceConfiguration = new TraceConfiguration { TraceMasks = Utils.TraceMasks.None },
+#pragma warning restore CS0618 // Type or member is obsolete
                 TransportQuotas = new TransportQuotas()
             };
 

Libraries/Opc.Ua.Server/Server/StandardServer.cs

@@ -2884,10 +2884,9 @@ await Configuration.CertificateValidator.UpdateAsync(
                     ct: cancellationToken).ConfigureAwait(false);
 
                 // update trace configuration.
+#pragma warning disable CS0618 // Type or member is obsolete
                 Configuration.TraceConfiguration = configuration.TraceConfiguration ??
                     new TraceConfiguration();
-
-#pragma warning disable CS0618 // Type or member is obsolete
                 Configuration.TraceConfiguration.ApplySettings();
 #pragma warning restore CS0618 // Type or member is obsolete
             }

Stack/Opc.Ua.Core/Schema/ApplicationConfiguration.cs

@@ -77,7 +77,9 @@ public ApplicationConfiguration(ApplicationConfiguration template)
             DisableHiResClock = template.DisableHiResClock;
             CertificateValidator = template.CertificateValidator;
             TransportQuotas = template.TransportQuotas;
+#pragma warning disable CS0618 // Type or member is obsolete
             TraceConfiguration = template.TraceConfiguration;
+#pragma warning restore CS0618 // Type or member is obsolete
             m_extensions = template.m_extensions;
             m_extensionObjects = template.m_extensionObjects;
             SourceFilePath = template.SourceFilePath;
@@ -240,6 +242,7 @@ public XmlElementCollection Extensions
         /// </summary>
         /// <value>The trace configuration.</value>
         [DataMember(IsRequired = false, EmitDefaultValue = false, Order = 11)]
+        [Obsolete("Use ITelemetryContext and ILogger-based diagnostics instead.")]
         public TraceConfiguration TraceConfiguration { get; set; }
 
         /// <summary>

Stack/Opc.Ua.Core/Stack/Configuration/ApplicationConfiguration.cs

@@ -518,12 +518,12 @@ public static async Task<ApplicationConfiguration> LoadAsync(
             if (configuration != null)
             {
                 // should not be here but need to preserve old behavior.
+#pragma warning disable CS0618 // Type or member is obsolete
                 if (applyTraceSettings && configuration.TraceConfiguration != null)
                 {
-#pragma warning disable CS0618 // Type or member is obsolete
                     configuration.TraceConfiguration.ApplySettings();
-#pragma warning restore CS0618 // Type or member is obsolete
                 }
+#pragma warning restore CS0618 // Type or member is obsolete
 
                 configuration.SecurityConfiguration.CertificatePasswordProvider
                     = certificatePasswordProvider;

Tests/Opc.Ua.Core.Tests/Stack/Schema/ApplicationConfigurationObsoleteTests.cs

@@ -0,0 +1,63 @@
+/* ========================================================================
+ * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
+ *
+ * OPC Foundation MIT License 1.00
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The complete license agreement can be found here:
+ * http://opcfoundation.org/License/MIT/1.00/
+ * ======================================================================*/
+
+using System;
+using System.Reflection;
+using NUnit.Framework;
+
+namespace Opc.Ua.Core.Tests.Stack.Schema
+{
+    /// <summary>
+    /// Tests for obsolete application configuration schema members.
+    /// </summary>
+    [TestFixture]
+    [Category("ApplicationConfiguration")]
+    [SetCulture("en-us")]
+    [SetUICulture("en-us")]
+    [Parallelizable]
+    public class ApplicationConfigurationObsoleteTests
+    {
+        [Test]
+        public void TraceConfigurationPropertyIsObsolete()
+        {
+            PropertyInfo traceConfigurationProperty = typeof(ApplicationConfiguration)
+                .GetProperty("TraceConfiguration");
+
+            Assert.That(traceConfigurationProperty, Is.Not.Null);
+
+            ObsoleteAttribute obsoleteAttribute =
+                traceConfigurationProperty.GetCustomAttribute<ObsoleteAttribute>();
+
+            Assert.That(obsoleteAttribute, Is.Not.Null);
+            Assert.That(
+                obsoleteAttribute.Message,
+                Is.EqualTo("Use ITelemetryContext and ILogger-based diagnostics instead."));
+        }
+    }
+}

Tests/Opc.Ua.Gds.Tests/GlobalDiscoveryTestClient.cs

@@ -271,8 +271,10 @@ public async Task DisconnectClientAsync()
 
         public string ReadLogFile()
         {
+#pragma warning disable CS0618 // Type or member is obsolete
             return File.ReadAllText(
                 Utils.ReplaceSpecialFolderNames(Configuration.TraceConfiguration.OutputFilePath));
+#pragma warning restore CS0618 // Type or member is obsolete
         }
 
         private async Task ApplyNewApplicationInstanceCertificateAsync(

Tests/Opc.Ua.Gds.Tests/ServerConfigurationPushTestClient.cs

@@ -180,8 +180,10 @@ public async Task DisconnectClientAsync()
 
         public string ReadLogFile()
         {
+#pragma warning disable CS0618 // Type or member is obsolete
             return File.ReadAllText(
                 Utils.ReplaceSpecialFolderNames(Config.TraceConfiguration.OutputFilePath));
+#pragma warning restore CS0618 // Type or member is obsolete
         }
 
         private void CertificateValidator_CertificateValidation(