I've just published logstash-input-ping.
It is meant to acquire ping metrics directly from logstash: the same can be done using PingBeat or other stuff...
in fact I did it just to learn some ruby 
However if there's some interest I can further enhance it.
i.e. exposing some way to fine tune the probes used at lower level by the net-ping library or exposing a one shot mode, as currently it continuously produces data in loop-with-sleep or scheduled mode.
The project is hosted at https://github.com/davidecavestro/logstash-input-ping