Support multiple workers

Author: kuldazbraslav

lib/fluent/plugin/out_detect_exceptions.rb

@@ -41,6 +41,10 @@ class DetectExceptionsOutput < Output
 
     Fluent::Plugin.register_output('detect_exceptions', self)
 
+    def multi_workers_ready?
+      true
+    end
+
     def configure(conf)
       super