feat(elastic): optional configureLogger hook for extra Serilog sinks

README.md

@@ -88,6 +88,17 @@ public static IHostBuilder CreateHostBuilder(string[] args) =>
         });
 ```
 
+To add more Serilog sinks or enrichers, pass `configureLogger`; it runs after the built-in ones. Serilog replaces the .NET logging pipeline, so a logging provider such as Sentry's never receives these logs unless it is added here as a Serilog sink:
+
+```csharp
+builder.Host.UseSwElasticSearchLogger(configureLogger: (context, loggerConfiguration) =>
+    loggerConfiguration.WriteTo.Sentry(o =>
+    {
+        o.InitializeSdk = false; // already initialized by UseSentry
+        o.MinimumEventLevel = LogEventLevel.Error;
+    }));
+```
+
 #### 2. Configure Application Pipeline
 
 ```csharp

SW.Logger.ElasticSearch/IHostBuilderExtensions.cs

@@ -22,7 +22,15 @@ namespace SW.Logger.ElasticSerach
 {
     public static class IHostBuilderExtensions
     {
-        public static IHostBuilder UseSwElasticSearchLogger(this IHostBuilder builder, Action<LoggerOptions> configure = null)
+        /// <param name="configure">Overrides the options read from the "SwLogger" configuration section.</param>
+        /// <param name="configureLogger">
+        /// Runs after the built-in sinks are configured, to add more sinks or enrichers (for example
+        /// Sentry). UseSerilog replaces the .NET logging pipeline, so a logging provider registered
+        /// elsewhere never receives these logs; a Serilog sink added here does.
+        /// </param>
+        public static IHostBuilder UseSwElasticSearchLogger(this IHostBuilder builder,
+            Action<LoggerOptions> configure = null,
+            Action<HostBuilderContext, LoggerConfiguration> configureLogger = null)
         {
             var loggerOptions = new LoggerOptions
             {
@@ -32,7 +40,10 @@ public static IHostBuilder UseSwElasticSearchLogger(this IHostBuilder builder, A
             if (configure != null) configure.Invoke(loggerOptions);
 
             return builder.UseSerilog((hostBuilderContext, loggerConfiguration) =>
-                ConfigureSerilog(hostBuilderContext, loggerConfiguration, loggerOptions));
+            {
+                ConfigureSerilog(hostBuilderContext, loggerConfiguration, loggerOptions);
+                configureLogger?.Invoke(hostBuilderContext, loggerConfiguration);
+            });
         }
 
         private static LoggerConfiguration ConfigureSerilog(HostBuilderContext hostBuilderContext,