Merge remote-tracking branch 'Cloudstek/mdeboer/docs-fallbackhandler'

Author: Seldaek

DependencyInjection/Configuration.php

@@ -148,6 +148,10 @@
  *   - members: the wrapped handlers by name
  *   - [bubble]: bool, defaults to true
  *
+ * - fallbackgroup
+ *   - members: the wrapped handlers by name
+ *   - [bubble]: bool, defaults to true
+ *
  * - syslog:
  *   - ident: string
  *   - [facility]: defaults to 'user', use any of the LOG_* facility constant but without LOG_ prefix, e.g. user for LOG_USER
@@ -528,7 +532,7 @@ public function getConfigTreeBuilder()
                     ->canBeUnset()
                     ->prototype('scalar')->end()
                 ->end() // rollbar
-                ->arrayNode('members') // group, whatfailuregroup
+                ->arrayNode('members') // group, whatfailuregroup, fallbackgroup
                     ->canBeUnset()
                     ->performNoDeepMerging()
                     ->prototype('scalar')->end()