When using Microsoft System Center Operations Manager Server 2007 R2 with the Microsoft SQL Server Management Pack, items within SQL Server Replication report a Not Monitored state under Publication State, Publisher State and Subscription State.
This behavior is by design. There are no replication monitors in the Microsoft SQL Server Management Pack for Operations Manager 2007 SP1 and R2. http://www.microsoft.com/download/en/details.aspx?id=10631. If you check in Authoring Console Monitors for SQL replication you will see that when the SQL 2008 Publication\Entity Health\Availability entry is expanded there is no monitor to update information to rollup monitors.
Replication monitors are introduced in the SQL Server 2012 Management Pack that will be released following the release of System Center 2012 Operations Manager.
This article only applies to the Microsoft SQL Server Management Pack for Operations Manager 2007 SP1 and R2 . This Management Pack provides discovery and monitoring of SQL Server 2005, 2008, and 2008 R2.