Personally I push those off to my network monitor. Nagios in my case.
I find a single integrated alert and escalation framework is better than individual tools, but that's just me.
If you're using Nagios, let me know, and I can pop you several stub scripts to help.
Personally, I'm a huge fan of grafana and collectd It's definitely not a pre-packaged solution, but it's simple, easy to use and very, VERY fast. Alerts with nagios work, but, nagios is awful with history and trending, but, it beats most others for just alerts