Service Provider Self healing ha-cluster can and are being manage with the following tools:
1- NGINX or POUND or PERLBAL or HAProxy  for LBS
2- WackaMole/Spread ..... For DNS / FOS
3- PUPPET / RPATH...... Rapid System Build
4- GroundWork/Hyperic for Network Management/System Management/Apps
5- XMPP ... no need for explanation
6- Kayako .... eTickets

-E
http://gpro.ws