Open Source Go Network Monitoring Software for BSD

Prometheus is a leading open source systems and service monitoring solution. It works by collecting metrics from configured targets at given intervals, evaluating rule expressions, and then displaying the results. It can also signal an alert if a condition is observed to be true. What sets Prometheus apart from other monitoring systems is its highly dimensional data model, powerful query language, autonomous single server nodes, among many other distinguishing features. It also offers several client libraries for easy instrumentation of services, as well as many integration options.

Nagios Proxy is a client server system intended to be used in a secure environment. The client will appear to external software as a Nagios service. It accepts any data on the Nagios command fifo and forwards it to the server. When HUPped it collects the config files and forward those to the server. The server will pass commands and config files on to the real Nagios process.