ext.rb in ddtrace-1.9.0

- old
+ new

@@ -9,9 +9,10 @@
         module Ext
           ENV_ENABLED = 'DD_TRACE_HTTPRB_ENABLED'.freeze
           ENV_SERVICE_NAME = 'DD_TRACE_HTTPRB_SERVICE_NAME'.freeze
           ENV_ANALYTICS_ENABLED = 'DD_TRACE_HTTPRB_ANALYTICS_ENABLED'.freeze
           ENV_ANALYTICS_SAMPLE_RATE = 'DD_TRACE_EHTTPRB_ANALYTICS_SAMPLE_RATE'.freeze
+          ENV_ERROR_STATUS_CODES = 'DD_TRACE_HTTPCLIENT_ERROR_STATUS_CODES'.freeze
           DEFAULT_PEER_SERVICE_NAME = 'httprb'.freeze
           SPAN_REQUEST = 'httprb.request'.freeze
           TAG_COMPONENT = 'httprb'.freeze
           TAG_OPERATION_REQUEST = 'request'.freeze
         end