We are using containers (namely OpenVZ) more then 6 years now in production. And we are very happy with the solution. Till now when mentioning “virtualization” or VPS everybody thought about VMWare, KVM (used also by Amazon), OpenStack and similar
sFlow
Monitoring converged networks using the sFlow® standard This article describes how to install and configure sFlow monitoring on a Proxmox VE server using the open source Host sFlow agent. sFlow The Host sFlow agent exports physical and virtual server performance metrics