https://docs.mulesoft.com/mule-gateway/policies-included-message-logging
This document was supposed to point out to Mule Message policy for mule runtime. but someone it has not contents from flex gateway. This does not work.
Apart from this basic message policy configurations like #[attributes] dont even work now.
Even there is no mention about supported fields in message properties like attributes.remoteAddress, attributes.localAddress .
Either the document is out of date or incorrect, or policy is not working.