Default the sink to not tracing its own outbound requests, when possible

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.100",
+    "version": "8.0.201",
     "rollForward": "latestFeature"
   }
 }

src/Serilog.Sinks.Seq/SeqLoggerConfigurationExtensions.cs

@@ -36,7 +36,7 @@ public static class SeqLoggerConfigurationExtensions
     static readonly TimeSpan DefaultPeriod = TimeSpan.FromSeconds(2);
     const int DefaultQueueSizeLimit = 100000;
     static ITextFormatter CreateDefaultFormatter() => new SeqCompactJsonFormatter();
-
+    
     /// <summary>
     /// Write log events to a <a href="https://datalust.co/seq">Seq</a> server.
     /// </summary>

src/Serilog.Sinks.Seq/Sinks/Seq/Http/SeqIngestionApiClient.cs

@@ -29,7 +29,7 @@ sealed class SeqIngestionApiClient : SeqIngestionApi
 {
     const string BulkUploadResource = "api/events/raw";
     const string ApiKeyHeaderName = "X-Seq-ApiKey";
-        
+
     readonly string? _apiKey;
     readonly HttpClient _httpClient;
 
@@ -50,6 +50,7 @@ public SeqIngestionApiClient(string serverUrl, string? apiKey, HttpMessageHandle
             _httpClient = new HttpClient();
         }
 #endif
+
 #if SOCKETS_HTTP_HANDLER_ALWAYS_DEFAULT
         else
         {
@@ -59,14 +60,19 @@ public SeqIngestionApiClient(string serverUrl, string? apiKey, HttpMessageHandle
                 // require that the Seq API be accessed at a different IP address. Setting a timeout here puts
                 // an upper bound on the duration of DNS-related outages, while hopefully incurring only infrequent
                 // connection reestablishment costs.
-                PooledConnectionLifetime = TimeSpan.FromMinutes(5)
+                PooledConnectionLifetime = TimeSpan.FromMinutes(5),
+
+                // Don't trace the sink's own requests. On platforms that use alternative message handler implementations
+                // by default, the caller needs to do this manually and pass a handler through. Where `SocketsHttpHandler`
+                // is the default, we can safely set this without inadvertently causing behavior changes.
+                ActivityHeadersPropagator = null
             });
         }
 #else
-            else
-            {
-                _httpClient = new HttpClient();
-            }
+        else
+        {
+            _httpClient = new HttpClient();
+        }
 #endif
 
         _httpClient.BaseAddress = new Uri(NormalizeServerBaseAddress(serverUrl));