added level to introspection processor

src/Monolog/Processor/IntrospectionProcessor.php

@@ -11,6 +11,8 @@
 
 namespace Monolog\Processor;
 
+use Monolog\Logger;
+
 /**
  * Injects line/file:class/function where the log message came from
  *
@@ -24,12 +26,24 @@ namespace Monolog\Processor;
  */
 class IntrospectionProcessor
 {
+    private $level;
+
+    public function __construct($level = Logger::DEBUG)
+    {
+        $this->level = $level;
+    }
+
     /**
      * @param  array $record
      * @return array
      */
     public function __invoke(array $record)
     {
+        // return if the level is not high enough
+        if ($record['level'] < $this->level) {
+            return $record;
+        }
+
         $trace = debug_backtrace();
 
         // skip first since it's always the current method