Merge pull request #6705 from coopdevs/fix-request-queuing-tracking

Pass request_queuing setting to Rack middleware

config/initializers/datadog.rb

@@ -3,7 +3,10 @@ if ENV['DATADOG_RAILS_APM']
     c.use :rails, service_name: 'rails'
     c.use :delayed_job, service_name: 'delayed_job'
     c.use :dalli, service_name: 'memcached'
+
     c.analytics_enabled = true
     c.runtime_metrics_enabled = true
+
+    c[:rack].request_queuing = true
   end
 end