In part one of this series the basic trusses needed by the Nagios check_systemhealth script were put together. In part two the actual checks themselves were coded. In this the third and final part of the series compulsory checks are added, the main loop is constructed and the finall full source listing produced. It is worth noting that this is only one of many methods to achieve the same goal. There exists at Nagios exchange plugins and scripts that can do similar actions such as aggregate groups of checks, services and so on. The code presented in this series is just a touch upon a single idea designed to make the reader think about their monitoring deployment.