Please don't down vote this question as well.  I have a genuine question and probably am not phrasing the question correctly.  I asked the following question in serverfault and it was closed as "Not a real question".    

https://serverfault.com/questions/490317/what-metrics-should-i-monitor-to-guarantee-scalability-high-availability?noredirect=1#comment547719_490317

Would you please let me know where I am offending the moderators?  Is shortlisting metrics that indicate the scalability and HA of the website very broad question?  Are requests for guidelines out of scope of Serverfault?

Regards,
Raj