From https://plugins.jenkins.io/TestFairy/

Custom changelog
In order to add your own changelog or comments, please create a text file in the following location: $JENKINS_HOME/jobs/$JOB_NAME/builds/$BUILD_ID/testfairy_change_log

The content of this file will override the default changelog

That logic not works as expected due:

• accessing jenkins system dir - will not work correct on nodes
• need some special action for copy to this directory (like call bash or cmd)

This change allow use testfairy_change_log from artifacts (need call Archive the Artifacts with testfairy_change_log before TestFairy Upload). Also it fix charset issue - file can be not only in ASCII charset.

Thanks.

Pull request https://github.com/jenkinsci/testfairy-plugin/pull/18