When our service was first constructed a very expensive piece of software was purchased to perform availability monitoring, however, Mr. Heisenberg was forgotten and the load associated with that particular tool was sufficient to detrimentally impact the system. The tool itself was sold as the usual universal panacea, however, in implementation it was clear that its forte was component monitoring and not service monitoring.
Running a live system with this tool gave us all sorts of problems. The tool required agents on all machines and was really only designed around component availability and even then this was often measured from the wrong place (inside the firewall).
We took a look at the open source offerings available at that time and selected two.
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