Extract metric extraction in new method
Extract metric extraction in new method

we guarantee that mutex is unlocked once extractMetrics
method returns. This is more safer way of unlocking mutex.

baris/fullerite,Yelp/fullerite,mikepea/fullerite,Yelp/fullerite,Yelp/fullerite,mikepea/fullerite,baris/fullerite,mikepea/fullerite,venkey-ariv/fullerite,mikepea/fullerite,venkey-ariv/fullerite,baris/fullerite,venkey-ariv/fullerite,venkey-ariv/fullerite,baris/fullerite,Yelp/fullerite