remove metrics calculation code from the push server

Based on the ML discussions, we are removing the complex code that does all of the expensive metric processing, for a much more simpler (boolean) "metric":

• Success(fully connected to 3rd party system)
• Failure (to connect to 3rd party system)

Details can be found on the mailing list thread, that is archived here:
INSERT_LINK_WHEN_ACTUALLY_ARCHIVED :-P