Added initial docs of metrics
Added initial docs of metrics

kemiz/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,barakb/gigaspaces-wiki-jekyll,barakb/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,barakb/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,barakb/gigaspaces-wiki-jekyll