optimal solution for application deployed on multiple server

I have face one question which is below "You application has been deployed on multiple servers and you wish to keep checking the health of each of the servers continuously. what would be an optimal solutions to this problems".

please suggest the pr开发者_开发百科oper solution of this question.

Probably the IIS Health Monitoring framework would be a good way to answer if it's a mainly Windows shop, though tbh a separate set of *nix servers running Nagios would probably be a better solution overall.