Jenkins 2.21 发布，可扩展的持续集成引擎

Jenkins 2.21 发布了，Jenkins 主要用于持续、自动地构建/测试软件项目，如 CruiseControl 与 DamageControl，监控一些定时执行的任务。

更新如下：

• Ask for confirmation before canceling/aborting runs. (issue 30565)

• Add newline after the text in userContent/readme.txt. (PR #2532)

• Fixed the missing icon in the System Script console. (issue 37814)

• Print warnings to system logs and administrative monitors when Jenkins initializarion does not reach the final milestone. (issue 37874, diagnostics for issue-37759)

• Developer API: UpdateSite#getJsonSignatureValidator() can be now overriden and used in plugins. (PR #2532)

更新日志：

• https://jenkins.io/changelog/

下载：

• Source code (zip)

• Source code (tar.gz)

• https://jenkins.io/