This gem patches default Ruby log formatter so that every line includes a digest of current process PID + current thread id so that you can easily grep the logs of every particular thread. It also adds the metadata part to each line of the message in case it is multiline.
> Logger.new(STDOUT).info("Line 1\nLine 2") I, [2016-05-23T22:33:40.649346 #13604] INFO -- : Line 1 Line 2
> Logger.new(STDOUT).info("Line 1\nLine 2") I [2016-05-23T22:32:30.483767] #bd134bb0: Line 1 I [2016-05-23T22:32:30.483767] #bd134bb0: Line 2
The gem is available as open source under the terms of the MIT License.
Created by Yuri Smirnov.