In Operations Manager 2007 Sp1 when you created a distributed application there was also a group created, including all objects in the distributed application. I cant find a corresponding group in Ops Mgr R2. I used that group for notification, notification for everything in a distributed application. If you want to do the same thing in R2, get notification for all new alerts for all objects in a distributed application, you can

1. Create a distributed application
2. Create a new group with the following forumla “( Object is Contoso - Distributed Application - Spoolers AND ( Display Name Matches wildcard * ) AND True ) “. “Contoso – Distributed Application – Spoolers”  is the name of my distributed application. To build the forumla select your distributed application as class and then “Display Name Matches wildcard *” as expression. Remember to add the forumla under dynamic members.
3. Create a new subscription with the following subscription critiera
Notify on all alerts
raised by any instance in a Contoso - Group - Print Spooler DA group
and with New (0) resolution state
“Contoso – Group – Print Spooler DA” is the name of my group.