include unicorn+newrelic initializer

config/initializers/unicorn.rb

@@ -0,0 +1,7 @@
+# Ensure the agent is started using Unicorn.
+# This is needed when using Unicorn and preload_app is not set to true.
+# See https://newrelic.com/docs/ruby/no-data-with-unicorn
+if defined? Unicorn
+  ::NewRelic::Agent.manual_start()
+  ::NewRelic::Agent.after_fork(:force_reconnect => true)
+end