Something like this for the compatibility section of the release notes.
<para>To reduce the amount of background network traffic, the default
monitoring-period for replication servers has been raised from 3 seconds
(3000 ms) to 60 seconds. As a result it can take longer for directory
servers to switch to a more suitable replication server. In most
deployments, such switches are rare.</para>
OPENDJ-951Reduce size and frequency of replication MonitorMsg