Allow to add extra fields

src/Monolog/Processor/WebProcessor.php

@@ -74,6 +74,18 @@ class WebProcessor
         return $record;
     }
 
+    /**
+     * @param string $extraName
+     * @param string $serverName
+     * @return $this
+     */
+    public function addExtraField($extraName, $serverName)
+    {
+        $this->extraFields[$extraName] = $serverName;
+
+        return $this;
+    }
+    
     /**
      * @param  array $extra
      * @return array