Pharos
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BEACON / PHAROS (φάρος), (...) The system was reportedly created by Leo the Mathematician, who devised a code tor the interpretation of signals, and had two identical water clocks (see Horologion) made for the terminal stations. His work took account of the difference in longitude and of the time the signal needed for transmission. Modern experiments suggest that one hour would suffice for the entire distance. The beacons consisted of huge bonfires on platforms or towers within fortifications on isolated hills. (...) [^1]
[^1]: The Oxford Dictionary of Byzantium, Vol I.
Pharos is a "plugin-based" monitor and alert manager for BEAM Nodes and Hosts.
Development
Further documentation can be found at https://hexdocs.pm/pharos.