mm

src/WireMock.Net.Minimal/Extensions/DictionaryExtensions.cs

@@ -1,31 +0,0 @@
-// Copyright © WireMock.Net
-
-using System.Collections;
-using System.Diagnostics.CodeAnalysis;
-using Stef.Validation;
-
-namespace WireMock.Extensions;
-
-internal static class DictionaryExtensions
-{
-    public static bool TryGetStringValue(this IDictionary dictionary, string key, [NotNullWhen(true)] out string? value)
-    {
-        Guard.NotNull(dictionary);
-        
-        if (dictionary[key] is string valueIsString)
-        {
-            value = valueIsString;
-            return true;
-        }
-
-        var valueToString = dictionary[key]?.ToString();
-        if (valueToString != null)
-        {
-            value = valueToString;
-            return true;
-        }
-
-        value = default;
-        return false;
-    }
-}

src/WireMock.Net.Minimal/Owin/ActivityTracing/ActivityTracingOptions.cs

@@ -0,0 +1,38 @@
+// Copyright © WireMock.Net
+
+#if ACTIVITY_TRACING_SUPPORTED
+
+namespace WireMock.Owin.ActivityTracing;
+
+/// <summary>
+/// Options for controlling activity tracing in WireMock.Net middleware.
+/// These options control the creation of System.Diagnostics.Activity objects
+/// but do not require any OpenTelemetry exporter dependencies.
+/// </summary>
+public class ActivityTracingOptions
+{
+    /// <summary>
+    /// Gets or sets a value indicating whether to exclude admin interface requests from tracing.
+    /// Default is <c>true</c>.
+    /// </summary>
+    public bool ExcludeAdminRequests { get; set; } = true;
+
+    /// <summary>
+    /// Gets or sets a value indicating whether to record request body in trace attributes.
+    /// Default is <c>false</c> due to potential PII concerns.
+    /// </summary>
+    public bool RecordRequestBody { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether to record response body in trace attributes.
+    /// Default is <c>false</c> due to potential PII concerns.
+    /// </summary>
+    public bool RecordResponseBody { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether to record mapping match details in trace attributes.
+    /// Default is <c>true</c>.
+    /// </summary>
+    public bool RecordMatchDetails { get; set; } = true;
+}
+#endif

src/WireMock.Net.Minimal/Owin/ActivityTracing/ActivityTracingValidator.cs

@@ -0,0 +1,34 @@
+// Copyright © WireMock.Net
+
+#if !ACTIVITY_TRACING_SUPPORTED
+using System;
+#endif
+using WireMock.Settings;
+
+namespace WireMock.Owin.ActivityTracing;
+
+/// <summary>
+/// Validator for Activity Tracing configuration.
+/// </summary>
+internal static class ActivityTracingValidator
+{
+    /// <summary>
+    /// Validates that Activity Tracing is supported on the current framework.
+    /// Throws an exception if ActivityTracingOptions is configured on an unsupported framework.
+    /// </summary>
+    /// <param name="settings">The WireMock server settings to validate.</param>
+    /// <exception cref="System.InvalidOperationException">
+    /// Thrown when ActivityTracingOptions is configured but the current framework does not support System.Diagnostics.Activity.
+    /// </exception>
+    public static void ValidateActivityApiPresence(WireMockServerSettings settings)
+    {
+#if !ACTIVITY_TRACING_SUPPORTED
+        if (settings.ActivityTracingOptions is not null)
+        {
+            throw new InvalidOperationException(
+                "Activity Tracing is not supported on this target framework. " +
+                "It requires .NET 5.0 or higher which includes System.Diagnostics.Activity support.");
+        }
+#endif
+    }
+}

src/WireMock.Net.Minimal/Owin/ActivityTracing/WireMockActivitySource.cs

@@ -0,0 +1,200 @@
+// Copyright © WireMock.Net
+
+#if ACTIVITY_TRACING_SUPPORTED
+using System;
+using System.Diagnostics;
+using WireMock.Logging;
+
+namespace WireMock.Owin.ActivityTracing;
+
+/// <summary>
+/// Provides an ActivitySource for WireMock.Net distributed tracing.
+/// </summary>
+public static class WireMockActivitySource
+{
+    /// <summary>
+    /// The name of the ActivitySource used by WireMock.Net.
+    /// </summary>
+    internal const string SourceName = "WireMock.Net";
+
+    /// <summary>
+    /// The ActivitySource instance used for creating tracing activities.
+    /// </summary>
+    public static readonly ActivitySource Source = new(SourceName, GetVersion());
+
+    private static string GetVersion()
+    {
+        return typeof(WireMockActivitySource).Assembly.GetName().Version?.ToString() ?? "1.0.0";
+    }
+
+    /// <summary>
+    /// Starts a new activity for a WireMock request.
+    /// </summary>
+    /// <param name="requestMethod">The HTTP method of the request.</param>
+    /// <param name="requestPath">The path of the request.</param>
+    /// <returns>The started activity, or null if tracing is not enabled.</returns>
+    internal static Activity? StartRequestActivity(string requestMethod, string requestPath)
+    {
+        if (!Source.HasListeners())
+        {
+            return null;
+        }
+
+        var activity = Source.StartActivity(
+            $"WireMock {requestMethod} {requestPath}",
+            ActivityKind.Server
+        );
+
+        return activity;
+    }
+
+    /// <summary>
+    /// Enriches an activity with request information.
+    /// </summary>
+    internal static void EnrichWithRequest(Activity? activity, IRequestMessage request, ActivityTracingOptions? options = null)
+    {
+        if (activity == null)
+        {
+            return;
+        }
+
+        activity.SetTag(WireMockSemanticConventions.HttpMethod, request.Method);
+        activity.SetTag(WireMockSemanticConventions.HttpUrl, request.Url);
+        activity.SetTag(WireMockSemanticConventions.HttpPath, request.Path);
+        activity.SetTag(WireMockSemanticConventions.HttpHost, request.Host);
+
+        if (request.ClientIP != null)
+        {
+            activity.SetTag(WireMockSemanticConventions.ClientAddress, request.ClientIP);
+        }
+
+        // Record request body if enabled
+        if (options?.RecordRequestBody == true && request.Body != null)
+        {
+            activity.SetTag(WireMockSemanticConventions.RequestBody, request.Body);
+        }
+    }
+
+    /// <summary>
+    /// Enriches an activity with response information.
+    /// </summary>
+    internal static void EnrichWithResponse(Activity? activity, IResponseMessage? response, ActivityTracingOptions? options = null)
+    {
+        if (activity == null || response == null)
+        {
+            return;
+        }
+
+        // StatusCode can be int, HttpStatusCode, or string
+        var statusCode = response.StatusCode;
+        int? statusCodeInt = statusCode switch
+        {
+            int i => i,
+            System.Net.HttpStatusCode hsc => (int)hsc,
+            string s when int.TryParse(s, out var parsed) => parsed,
+            _ => null
+        };
+
+        if (statusCodeInt.HasValue)
+        {
+            activity.SetTag(WireMockSemanticConventions.HttpStatusCode, statusCodeInt.Value);
+            activity.SetTag("otel.status_description", $"HTTP {statusCodeInt.Value}");
+
+            // Set status based on HTTP status code (using standard otel.status_code tag)
+            if (statusCodeInt.Value >= 400)
+            {
+                activity.SetTag("otel.status_code", "ERROR");
+            }
+            else
+            {
+                activity.SetTag("otel.status_code", "OK");
+            }
+        }
+
+        // Record response body if enabled
+        if (options?.RecordResponseBody == true && response.BodyData?.BodyAsString != null)
+        {
+            activity.SetTag(WireMockSemanticConventions.ResponseBody, response.BodyData.BodyAsString);
+        }
+    }
+
+    /// <summary>
+    /// Enriches an activity with mapping match information.
+    /// </summary>
+    internal static void EnrichWithMappingMatch(
+        Activity? activity, 
+        Guid? mappingGuid, 
+        string? mappingTitle,
+        bool isPerfectMatch,
+        double? matchScore)
+    {
+        if (activity == null)
+        {
+            return;
+        }
+
+        activity.SetTag(WireMockSemanticConventions.MappingMatched, isPerfectMatch);
+
+        if (mappingGuid.HasValue)
+        {
+            activity.SetTag(WireMockSemanticConventions.MappingGuid, mappingGuid.Value.ToString());
+        }
+
+        if (!string.IsNullOrEmpty(mappingTitle))
+        {
+            activity.SetTag(WireMockSemanticConventions.MappingTitle, mappingTitle);
+        }
+
+        if (matchScore.HasValue)
+        {
+            activity.SetTag(WireMockSemanticConventions.MatchScore, matchScore.Value);
+        }
+    }
+
+    /// <summary>
+    /// Enriches an activity with log entry information (includes response and mapping match info).
+    /// </summary>
+    internal static void EnrichWithLogEntry(Activity? activity, ILogEntry logEntry, ActivityTracingOptions? options = null)
+    {
+        if (activity == null)
+        {
+            return;
+        }
+
+        // Enrich with response
+        EnrichWithResponse(activity, logEntry.ResponseMessage, options);
+
+        // Enrich with mapping match (if enabled)
+        if (options?.RecordMatchDetails != false)
+        {
+            EnrichWithMappingMatch(
+                activity,
+                logEntry.MappingGuid,
+                logEntry.MappingTitle,
+                logEntry.RequestMatchResult?.IsPerfectMatch ?? false,
+                logEntry.RequestMatchResult?.TotalScore);
+        }
+
+        // Set request GUID
+        activity.SetTag(WireMockSemanticConventions.RequestGuid, logEntry.Guid.ToString());
+    }
+
+    /// <summary>
+    /// Records an exception on the activity.
+    /// </summary>
+    internal static void RecordException(Activity? activity, Exception exception)
+    {
+        if (activity == null)
+        {
+            return;
+        }
+
+        // Use standard OpenTelemetry exception semantic conventions
+        activity.SetTag("otel.status_code", "ERROR");
+        activity.SetTag("otel.status_description", exception.Message);
+        activity.SetTag("exception.type", exception.GetType().FullName);
+        activity.SetTag("exception.message", exception.Message);
+        activity.SetTag("exception.stacktrace", exception.ToString());
+    }
+}
+#endif

src/WireMock.Net.Minimal/Owin/ActivityTracing/WireMockSemanticConventions.cs

@@ -0,0 +1,28 @@
+// Copyright © WireMock.Net
+
+namespace WireMock.Owin.ActivityTracing;
+
+/// <summary>
+/// Semantic convention constants for WireMock.Net tracing attributes.
+/// </summary>
+internal static class WireMockSemanticConventions
+{
+    // Standard HTTP semantic conventions (OpenTelemetry)
+    public const string HttpMethod = "http.request.method";
+    public const string HttpUrl = "url.full";
+    public const string HttpPath = "url.path";
+    public const string HttpHost = "server.address";
+    public const string HttpStatusCode = "http.response.status_code";
+    public const string ClientAddress = "client.address";
+
+    // WireMock-specific attributes
+    public const string MappingMatched = "wiremock.mapping.matched";
+    public const string MappingGuid = "wiremock.mapping.guid";
+    public const string MappingTitle = "wiremock.mapping.title";
+    public const string MatchScore = "wiremock.match.score";
+    public const string PartialMappingGuid = "wiremock.partial_mapping.guid";
+    public const string PartialMappingTitle = "wiremock.partial_mapping.title";
+    public const string RequestGuid = "wiremock.request.guid";
+    public const string RequestBody = "wiremock.request.body";
+    public const string ResponseBody = "wiremock.response.body";
+}

src/WireMock.Net.Minimal/Owin/IWireMockMiddlewareOptions.cs

@@ -5,6 +5,7 @@ using System.Collections.Concurrent;
 using WireMock.Handlers;
 using WireMock.Logging;
 using WireMock.Matchers;
+using WireMock.Owin.ActivityTracing;
 using WireMock.Types;
 using WireMock.Util;
 using System.Security.Cryptography.X509Certificates;
@@ -90,4 +91,12 @@ internal interface IWireMockMiddlewareOptions
     QueryParameterMultipleValueSupport? QueryParameterMultipleValueSupport { get; set; }
 
     public bool ProxyAll { get; set; }
+
+#if ACTIVITY_TRACING_SUPPORTED
+    /// <summary>
+    /// Gets or sets the activity tracing options.
+    /// When set, System.Diagnostics.Activity objects are created for request tracing.
+    /// </summary>
+    ActivityTracingOptions? ActivityTracingOptions { get; set; }
+#endif
 }

src/WireMock.Net.Minimal/Owin/WireMockMiddleware.cs

@@ -16,6 +16,10 @@ using System.Collections.Generic;
 using WireMock.Constants;
 using WireMock.Exceptions;
 using WireMock.Util;
+#if ACTIVITY_TRACING_SUPPORTED
+using System.Diagnostics;
+using WireMock.Owin.ActivityTracing;
+#endif
 #if !USE_ASPNETCORE
 using IContext = Microsoft.Owin.IOwinContext;
 using OwinMiddleware = Microsoft.Owin.OwinMiddleware;
@@ -97,6 +101,40 @@ namespace WireMock.Owin
         {
             var request = await _requestMapper.MapAsync(ctx.Request, _options).ConfigureAwait(false);
 
+#if ACTIVITY_TRACING_SUPPORTED
+            // Start activity if ActivityTracingOptions is configured
+            var tracingEnabled = _options.ActivityTracingOptions is not null;
+            var excludeAdmin = _options.ActivityTracingOptions?.ExcludeAdminRequests ?? true;
+            Activity? activity = null;
+            
+            // Check if we should trace this request (optionally exclude admin requests)
+            var shouldTrace = tracingEnabled && !(excludeAdmin && request.Path.StartsWith("/__admin/"));
+            
+            if (shouldTrace)
+            {
+                activity = WireMockActivitySource.StartRequestActivity(request.Method, request.Path);
+                WireMockActivitySource.EnrichWithRequest(activity, request, _options.ActivityTracingOptions);
+            }
+
+            try
+            {
+                await InvokeInternalCoreAsync(ctx, request, activity).ConfigureAwait(false);
+            }
+            finally
+            {
+                activity?.Dispose();
+            }
+#else
+            await InvokeInternalCoreAsync(ctx, request).ConfigureAwait(false);
+#endif
+        }
+
+#if ACTIVITY_TRACING_SUPPORTED
+        private async Task InvokeInternalCoreAsync(IContext ctx, RequestMessage request, Activity? activity)
+#else
+        private async Task InvokeInternalCoreAsync(IContext ctx, RequestMessage request)
+#endif
+        {
             var logRequest = false;
             IResponseMessage? response = null;
             (MappingMatcherResult? Match, MappingMatcherResult? Partial) result = (null, null);
@@ -193,6 +231,10 @@ namespace WireMock.Owin
             {
                 _options.Logger.Error($"Providing a Response for Mapping '{result.Match?.Mapping.Guid}' failed. HttpStatusCode set to 500. Exception: {ex}");
                 response = ResponseMessageBuilder.Create(500, ex.Message);
+
+#if ACTIVITY_TRACING_SUPPORTED
+                WireMockActivitySource.RecordException(activity, ex);
+#endif
             }
             finally
             {
@@ -211,6 +253,11 @@ namespace WireMock.Owin
                     PartialMatchResult = result.Partial?.RequestMatchResult
                 };
 
+#if ACTIVITY_TRACING_SUPPORTED
+                // Enrich activity with response and mapping info
+                WireMockActivitySource.EnrichWithLogEntry(activity, log, _options.ActivityTracingOptions);
+#endif
+
                 LogRequest(log, logRequest);
 
                 try

src/WireMock.Net.Minimal/Owin/WireMockMiddlewareOptions.cs

@@ -5,6 +5,7 @@ using System.Collections.Concurrent;
 using WireMock.Handlers;
 using WireMock.Logging;
 using WireMock.Matchers;
+using WireMock.Owin.ActivityTracing;
 using WireMock.Types;
 using WireMock.Util;
 using System.Security.Cryptography.X509Certificates;
@@ -106,4 +107,9 @@ internal class WireMockMiddlewareOptions : IWireMockMiddlewareOptions
 
     /// <inheritdoc />
     public bool ProxyAll { get; set; }
+
+#if ACTIVITY_TRACING_SUPPORTED
+    /// <inheritdoc />
+    public ActivityTracingOptions? ActivityTracingOptions { get; set; }
+#endif
 }

src/WireMock.Net.Minimal/Owin/WireMockMiddlewareOptionsHelper.cs

@@ -2,6 +2,7 @@
 
 using System;
 using Stef.Validation;
+using WireMock.Owin.ActivityTracing;
 using WireMock.Settings;
 
 namespace WireMock.Owin;
@@ -34,6 +35,27 @@ internal static class WireMockMiddlewareOptionsHelper
         options.RequestLogExpirationDuration = settings.RequestLogExpirationDuration;
         options.SaveUnmatchedRequests = settings.SaveUnmatchedRequests;
 
+        // Validate and configure activity tracing
+        ActivityTracingValidator.ValidateActivityApiPresence(settings);
+#if ACTIVITY_TRACING_SUPPORTED
+        if (settings.ActivityTracingOptions is not null)
+        {
+            options.ActivityTracingOptions = new Owin.ActivityTracing.ActivityTracingOptions
+            {
+                ExcludeAdminRequests = settings.ActivityTracingOptions.ExcludeAdminRequests,
+                RecordRequestBody = settings.ActivityTracingOptions.RecordRequestBody,
+                RecordResponseBody = settings.ActivityTracingOptions.RecordResponseBody,
+                RecordMatchDetails = settings.ActivityTracingOptions.RecordMatchDetails
+            };
+        }
+#endif
+#if USE_ASPNETCORE
+        options.AdditionalServiceRegistration = settings.AdditionalServiceRegistration;
+        options.CorsPolicyOptions = settings.CorsPolicyOptions;
+        options.ClientCertificateMode = settings.ClientCertificateMode;
+        options.AcceptAnyClientCertificate = settings.AcceptAnyClientCertificate;
+#endif
+
         if (settings.CustomCertificateDefined)
         {
             options.X509StoreName = settings.CertificateSettings!.X509StoreName;

src/WireMock.Net.Minimal/Server/WireMockServer.cs

@@ -412,11 +412,6 @@ public partial class WireMockServer : IWireMockServer
         );
 
 #if USE_ASPNETCORE
-        _options.AdditionalServiceRegistration = _settings.AdditionalServiceRegistration;
-        _options.CorsPolicyOptions = _settings.CorsPolicyOptions;
-        _options.ClientCertificateMode = _settings.ClientCertificateMode;
-        _options.AcceptAnyClientCertificate = _settings.AcceptAnyClientCertificate;
-
         _httpServer = new AspNetCoreSelfHost(_options, urlOptions);
 #else
         _httpServer = new OwinSelfHost(_options, urlOptions);

src/WireMock.Net.Minimal/Settings/SimpleSettingsParser.cs

@@ -1,187 +0,0 @@
-// Copyright © WireMock.Net
-
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.Linq;
-using WireMock.Extensions;
-using WireMock.Util;
-
-namespace WireMock.Settings;
-
-// Based on http://blog.gauffin.org/2014/12/simple-command-line-parser/
-internal class SimpleSettingsParser
-{
-    private const string Sigil = "--";
-    private const string Prefix = $"{nameof(WireMockServerSettings)}__";
-    private static readonly int PrefixLength = Prefix.Length;
-
-    private IDictionary<string, string[]> Arguments { get; } = new Dictionary<string, string[]>(StringComparer.OrdinalIgnoreCase);
-
-    public void Parse(string[] arguments, IDictionary? environment = null)
-    {
-        string currentName = string.Empty;
-
-        var values = new List<string>();
-
-        // Split a single argument on a space character to fix issue (e.g. Azure Service Fabric) when an argument is supplied like "--x abc" or '--x abc'
-        foreach (string arg in arguments.SelectMany(arg => arg.Split(' ')))
-        {
-            if (arg.StartsWith(Sigil))
-            {
-                if (!string.IsNullOrEmpty(currentName))
-                {
-                    Arguments[currentName] = values.ToArray();
-                }
-
-                values.Clear();
-                currentName = arg.Substring(Sigil.Length);
-            }
-            else if (string.IsNullOrEmpty(currentName))
-            {
-                Arguments[arg] = [];
-            }
-            else
-            {
-                values.Add(arg);
-            }
-        }
-
-        if (!string.IsNullOrEmpty(currentName))
-        {
-            Arguments[currentName] = values.ToArray();
-        }
-
-        // Now also parse environment
-        if (environment != null)
-        {
-            foreach (var key in environment.Keys.OfType<string>())
-            {
-                if (key.StartsWith(Prefix, StringComparison.OrdinalIgnoreCase) && environment.TryGetStringValue(key, out var value))
-                {
-                    Arguments[key.Substring(PrefixLength)] = value.Split(' ').ToArray();
-                }
-            }
-        }
-    }
-
-    public bool Contains(string name)
-    {
-        return Arguments.ContainsKey(name);
-    }
-
-    public bool ContainsAny(params string[] names)
-    {
-        return names.Any(Arguments.ContainsKey);
-    }
-
-    public string[] GetValues(string name, string[] defaultValue)
-    {
-        return Contains(name) ? Arguments[name] : defaultValue;
-    }
-
-    public string[]? GetValues(string name)
-    {
-        return Contains(name) ? Arguments[name] : default;
-    }
-
-    public T GetValue<T>(string name, Func<string[], T> func, T defaultValue)
-    {
-        return Contains(name) ? func(Arguments[name]) : defaultValue;
-    }
-
-    public T? GetValue<T>(string name, Func<string[], T> func)
-    {
-        return Contains(name) ? func(Arguments[name]) : default;
-    }
-
-    public bool GetBoolValue(string name, bool defaultValue = false)
-    {
-        return GetValue(name, values =>
-        {
-            var value = values.FirstOrDefault();
-            return !string.IsNullOrEmpty(value) ? bool.Parse(value) : defaultValue;
-        }, defaultValue);
-    }
-
-    public bool GetBoolSwitchValue(string name)
-    {
-        return Contains(name);
-    }
-
-    public int? GetIntValue(string name)
-    {
-        return GetValue<int?>(name, values =>
-        {
-            var value = values.FirstOrDefault();
-            return !string.IsNullOrEmpty(value) ? int.Parse(value) : null;
-        }, null);
-    }
-
-    public int GetIntValue(string name, int defaultValue)
-    {
-        return GetValue(name, values =>
-        {
-            var value = values.FirstOrDefault();
-            return !string.IsNullOrEmpty(value) ? int.Parse(value) : defaultValue;
-        }, defaultValue);
-    }
-
-    public TEnum? GetEnumValue<TEnum>(string name)
-        where TEnum : struct
-    {
-        return GetValue(name, values =>
-        {
-            var value = values.FirstOrDefault();
-            return Enum.TryParse<TEnum>(value, true, out var enumValue) ? enumValue : (TEnum?)null;
-        });
-    }
-
-    public TEnum GetEnumValue<TEnum>(string name, TEnum defaultValue)
-        where TEnum : struct
-    {
-        return GetValue(name, values =>
-        {
-            var value = values.FirstOrDefault();
-            return Enum.TryParse<TEnum>(value, true, out var enumValue) ? enumValue : defaultValue;
-        }, defaultValue);
-    }
-
-    public TEnum[] GetEnumValues<TEnum>(string name, TEnum[] defaultValues)
-        where TEnum : struct
-    {
-        var values = GetValues(name);
-        if (values == null)
-        {
-            return defaultValues;
-        }
-
-        var enums = new List<TEnum>();
-
-        foreach (var value in values)
-        {
-            if (Enum.TryParse<TEnum>(value, true, out var enumValue))
-            {
-                enums.Add(enumValue);
-            }
-        }
-
-        return enums.ToArray();
-    }
-
-    public string GetStringValue(string name, string defaultValue)
-    {
-        return GetValue(name, values => values.FirstOrDefault() ?? defaultValue, defaultValue);
-    }
-
-    public string? GetStringValue(string name)
-    {
-        return GetValue(name, values => values.FirstOrDefault());
-    }
-
-    public T? GetObjectValueFromJson<T>(string name)
-    {
-        var value = GetValue(name, values => values.FirstOrDefault());
-        return string.IsNullOrWhiteSpace(value) ? default : JsonUtils.DeserializeObject<T>(value);
-    }
-}

src/WireMock.Net.Minimal/Settings/WireMockServerSettingsParser.cs

@@ -85,6 +85,7 @@ public static class WireMockServerSettingsParser
         ParseProxyAndRecordSettings(settings, parser);
         ParseCertificateSettings(settings, parser);
         ParseHandlebarsSettings(settings, parser);
+        ParseActivityTracingSettings(settings, parser);
 
         return true;
     }
@@ -226,4 +227,19 @@ public static class WireMockServerSettingsParser
             };
         }
     }
+
+    private static void ParseActivityTracingSettings(WireMockServerSettings settings, SimpleSettingsParser parser)
+    {
+        // Only create ActivityTracingOptions if tracing is enabled
+        if (parser.GetBoolValue("ActivityTracingEnabled") || parser.GetBoolValue("ActivityTracingOptions__Enabled"))
+        {
+            settings.ActivityTracingOptions = new ActivityTracingOptions
+            {
+                ExcludeAdminRequests = parser.GetBoolWithDefault("ActivityTracingExcludeAdminRequests", "ActivityTracingOptions__ExcludeAdminRequests", defaultValue: true),
+                RecordRequestBody = parser.GetBoolValue("ActivityTracingRecordRequestBody") || parser.GetBoolValue("ActivityTracingOptions__RecordRequestBody"),
+                RecordResponseBody = parser.GetBoolValue("ActivityTracingRecordResponseBody") || parser.GetBoolValue("ActivityTracingOptions__RecordResponseBody"),
+                RecordMatchDetails = parser.GetBoolWithDefault("ActivityTracingRecordMatchDetails", "ActivityTracingOptions__RecordMatchDetails", defaultValue: true)
+            };
+        }
+    }
 }

src/WireMock.Net.Minimal/WireMock.Net.Minimal.csproj

@@ -52,6 +52,11 @@
         <DefineConstants>$(DefineConstants);TRAILINGHEADERS</DefineConstants>
     </PropertyGroup>
 
+    <!-- Enable Activity tracing support for .NET 5+ where ActivitySource is available -->
+    <PropertyGroup Condition="'$(TargetFramework)' == 'net5.0' or '$(TargetFramework)' == 'net6.0' or '$(TargetFramework)' == 'net7.0' or '$(TargetFramework)' == 'net8.0'">
+        <DefineConstants>$(DefineConstants);ACTIVITY_TRACING_SUPPORTED</DefineConstants>
+    </PropertyGroup>
+
     <ItemGroup>
       <Compile Remove="Matchers\LinqMatcher.cs" />
     </ItemGroup>