LEX now has an ability to observe in real time an object on multiple LDAP servers simultaneously. This is e.g. very useful if you want to have a closer look at the process of a directory replication. You can monitor an object or important attributes of an object in the Observation Factory so that you can see exactly when and where the appropriate changes were made to the directory data.
In the observation Factory, you can check for example whether one of your AD domain controllers replicated properly with the other. Or you could watch in which time interval and with what order objects are changed during the synchronization between different meta directories.