I'm looking for a tool like Canonical (system management and monitoring for Ubuntu) that is Open Source and free. The goal is to manage a dozen or so KVM machines for private testing purposes.

I know of puppet and munin or RHQ as separate tools to manage and monitor, but I'd prefer something integrated. Any tips?

Basic requirements would be:

• system package management and update (individual selection for each managed node)
• configuration of basic system services (Users, NFS, cron, ideally also Apache)
• monitoring (charting of system resources, disk, io, memory, etc) and alerting, ideally a default configuration with sensible values for alerts