Microsoft引入了一项称为已知问题回滚 (KIR)^{(Known Issue Rollback (KIR))}的新功能，旨在保护您的Windows 10设备并保持高效。在这篇文章中，我们将了解KIR功能在Windows 10中的工作原理以及它如何应用于最终用户（消费者）以及企业^(Enterprise)环境。

Windows 10中的已知问题回滚^{(Issue Rollback)}功能

此功能仅适用于非安全错误修复，并将帮助您将单个修复恢复到先前发布的状态。已知问题回滚^{(Known Issue Rollback)}功能从Windows 10 版本 2004^{(Windows 10, version 2004)}开始功能齐全（1909 和 1809 等旧版本也部分支持内置于操作系统中的KIR）——从那时起，每月发布更新，其中一些质量更改受保护已知问题回滚^{(Known Issue Rollback)}功能。

已知问题回滚^{(Known Issue Rollback)}如何适用于消费者（最终用户）

当Microsoft由于已知问题决定回滚更新中的错误修复时，会在云中进行配置更改。连接到Windows 更新^{(Windows Update)}或适用于企业^{(Windows Update for Business)}的 Windows 更新的设备会收到此更改的通知，并在下次重新启动时生效。

根据Microsoft的说法，您的系统接下来会发生以下情况：

While these devices would still require a reboot, in most cases we have identified and published a rollback before most end user devices would have had the chance to even install the update containing the issue. In other words, most end users will never see the regression!

已知问题回滚^{(Known Issue Rollback)}在企业中的工作原理

对于已知问题回滚^{(Known Issue Rollback)}，Microsoft将在下载中心^{(Download Center)}发布特定的组策略^{(Group Policy)}，IT管理员^{(Administrators)}可以使用该策略在企业内配置和应用回滚策略。Windows 更新知识库^{(Windows Update KB)}文章和发行说明中包含指向组策略^{(Group Policy)}的链接，作为“已知问题”的缓解措施。

微软^(Microsoft)进一步指出：

In the KB article, we describe the issue and related information to help you and your IT administrators make informed choices. Our customer service teams are also aware of the Known Issue Rollback system and will be able to work with customers to identify problems with monthly updates and in turn coordinate a rollback if necessary.

从本质上讲，选择向Microsoft提供诊断数据和有关正在执行的代码路径的特定信息的设备，来自最终用户和企业场景的这些数据有助于Microsoft了解回滚在生态系统中的成功程度。

What is the Known Issue Rollback feature in Windows 10

Microsoft has introduced a new featurе called Known Issue Rollback (KIR), which is intended to keep your Windows 10 devices protected and productive. In this post, we look at how the KIR feature works in Windows 10 and how it applies to end-users (consumers) as well as in the Enterprise environment.

Known Issue Rollback feature in Windows 10

This capability will only apply to non-security bugfixes and will help you revert a single fix to a previously released state. The Known Issue Rollback feature was fully functional beginning with Windows 10, version 2004 (older versions like 1909 and 1809 also have partial support for KIR built into the OS) – since then, monthly updates were been released with some of the quality changes protected by the Known Issue Rollback capability.

How Known Issue Rollback works for consumers (end-users)

When Microsoft decides to rollback a bug fix in an update because of a known issue, configuration changes are made in the cloud. Devices connected to Windows Update or Windows Update for Business are notified of this change and it takes effect with the next reboot.

According to Microsoft, the following is what happens next with your system:

While these devices would still require a reboot, in most cases we have identified and published a rollback before most end user devices would have had the chance to even install the update containing the issue. In other words, most end users will never see the regression!

How Known Issue Rollback works in the Enterprise

For a Known Issue Rollback, Microsoft will publish a specific Group Policy on the Download Center that can be used by IT Administrators to configure and apply a rollback policy within an enterprise. A link to the Group Policy is included in the Windows Update KB article and release notes as mitigations for a “Known Issue.”

Microsoft further states:

In the KB article, we describe the issue and related information to help you and your IT administrators make informed choices. Our customer service teams are also aware of the Known Issue Rollback system and will be able to work with customers to identify problems with monthly updates and in turn coordinate a rollback if necessary.

Essentially, devices that have opted to provide Microsoft with diagnostic data and specific information about which code-path is being exercised, this data from both the end-user and enterprise scenario helps Microsoft learn how well the rollback is succeeding in the ecosystem.

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