I have been working for cumulus since it was started as an internal project to help our customers manage their networks more efficiently. The product has grown tremendously over years - from being used internally by one team to now supporting multiple teams across many different customer sites. It’s not perfect but we are constantly improving things so that everyone can benefit from this great tool! We use cumulus for monitoring both physical infrastructure (i.e., power) and virtualized environments (VMware vSphere).