<http://schema.org/keywords>
"appdynamics, appfirst, cloudkick, dynatrace, engine yard, google appengine, heroku, new relic, opnet, optier, vmforce"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.virtualizationpractice.com/performance-management-for-platform-as-a-service-paas-clouds-8423/>