observium

Observium is a metrics collection, network observation and monitoring tool written in PHP. Observium uses SNMP to collect data from the devices. Observium offers automated monitoring of network, webmin modules for configuring Apache2, PHP, MySQL and Postfix, Extensive Device Support, libvirt for virtual machine monitoring, Traffic Accounting, External Integration with third party applications, integration for collectd, munin, smokeping and RANCID, support for IPv6 address tracking, VLAN tracking,  and Threshold Alerting.