logstash-loggable-bwc

Backward compatibility for the Loggable mixin which is not available on Logstash 2.4.1

In your Logstash plugin gemspec add/change

  s.add_runtime_dependency "logstash-core-plugin-api", ">= 1.60.5", "<= 2.99"
  s.add_runtime_dependency 'logstash-loggable-bwc'

Then in you plugin replace any require "logstash/util/loggable" with require "logstash-loggable-bwc"