ougai (rubygems):     A structured logging system is capable of handling a message, custom data or an exception easily.     It has JSON formatters compatible with Bunyan or pino for Node.js and human readable formatter with Amazing Print for console. 
Keywords: awesome-print|bunyan|fluentd-logger|gem|json-logging|logentries|logger|loggly|pino|rails-log|ruby|structured-logging