Answer:
Yes. you are correct. The documentation has not yet been updated with these changes.
APM Support can tell you what is in the details of the following defects:
DE176849
DE227080
DE206607
AND
DE269349
DE308581
There was also a change in encoding of metricOID and messageOID, which now support UTF-8.
Additional Information:
These have been requested to be documented in a future release