Some issues were found with the decorators in the unified logging framework during integration review. 
See http://mail.openjdk.java.net/pipermail/hotspot-dev/2015-September/019923.html

Other than the fixed ordering for all decorators, there is currently no way to distinguish between:
* PID and TID decorations
* Uptime and timestamp (eg. uptimemillis vs timemillis) decorations

One idea is to express which decorators are active in a given log, either by a decorator header or some special message at the beginning of each log.