A minimalistic adapter for github.com/gliderlabs/logspout to write to Logstash UDP
Follow the instructions in https://github.com/gliderlabs/logspout/tree/master/custom on how to build your own Logspout container with custom modules. Basically just copy the contents of the custom folder and include github.com/looplab/logspout-logstash (version 01/2016) in modules.go.
Use by setting
ROUTE_URIS=logstash://host:port to the Logstash host and port for UDP.
In your logstash config, set the input codec to
port => 5000
codec => json