Open Stack

Hi,

We are currently exploring monitoring solutions for the VMs we deploy 
for our customers in production. What I have been asked to deploy would 
be something akin to how you can see openvz container usage: you get 
memory usage, bandwidth, load and so forth for each container.

I know that ceilometer may be an option, but I believe operators use all 
kind of tools for their own ressource usage monitoring. So what do you 
people use?

(For this use case, we're looking for something that can be used without 
installing an agent in the VM, which makes it impossible to get a VM's 
load metric. I would be satisfied with cpu/memory/network/io metrics 
though.)