When running gateway 11.x traffic logs and audit logs are all configured to forwarded to stdout, This works for gateway and audit logs but traffic log is either not logged at all or not formatted as json when using json enriched logging which is the default for container gateway .
The root cause of the issue has been identified as a bug in SinkManagerImpl when creating a ConsoleMessageSink initialized with SinkConfiguration and log handlers when using the log override for the enriched logging.
This will be fixed in gateway 11.1.2