稳定性风险、升级投入成本、升级推进成本等等都是服务端推进组件升级的痛点。在贵州机房迁移项目中，面临着大量的组件升级，云音乐服务端通过自动化升级平台建设，节省约500人日，实现升级效率约83%的提升。此文介绍其在大规模自动化升级上的实践。

For the third part of this Fleet Management series, we’ll discuss what we call “fleet-wide refactoring” of code across thousands of Git repos: the tools we’ve built to enable fleet-wide refactoring and make it an everyday occurrence, how we rolled them out, and lessons we’ve learned along the way.