Enhance telemetry config with extended comments and improved header key documentation

config/telemetry.php

@@ -2,14 +2,53 @@
 
 declare(strict_types=1);
 
+/*
+|--------------------------------------------------------------------------
+| Laravel Telemetry — configuration
+|--------------------------------------------------------------------------
+|
+| Here you can configure the behavior of the telemetry collection package.
+| The file reads your code at runtime and is not cached separately.
+| If necessary, publish the configuration file and adjust the values to
+| your needs.
+|
+*/
+
 return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Telemetry context
+    |--------------------------------------------------------------------------
+    |
+    | The root context key. Used to group telemetry data in arrays/logs/reporters.
+    | Change only when explicitly necessary.
+    |
+    */
     'context' => [
         'key' => 'telemetry',
     ],
 
+    /*
+    |--------------------------------------------------------------------------
+    | HTTP header names
+    |--------------------------------------------------------------------------
+    |
+    | Configure the names of incoming/outgoing headers that will be used to
+    | transfer telemetry data between services.
+    |
+    | They must remain consistent across all services that exchange telemetry.
+    |
+    */
     'headers' => [
-        'user_id'  => 'X-Telemetry-User-Id',
-        'ip'       => 'X-Telemetry-Ip',
+
+        // Authenticated user's identifier (if any)
+        'user_id' => 'X-Telemetry-User-Id',
+
+        // Client IP address captured on ingress
+        'ip' => 'X-Telemetry-Ip',
+
+        // Request trace identifier (trace/span)
         'trace_id' => 'X-Telemetry-Trace-Id',
     ],
 ];