# Feature flag controls
> 原文:[https://docs.gitlab.com/ee/development/feature_flags/controls.html](https://docs.gitlab.com/ee/development/feature_flags/controls.html)
* [Access](#access)
* [Rolling out changes](#rolling-out-changes)
* [Enabling a feature for preproduction testing](#enabling-a-feature-for-preproduction-testing)
* [Enabling a feature for GitLab.com](#enabling-a-feature-for-gitlabcom)
* [Communicate the change](#communicate-the-change)
* [Process](#process)
* [Feature flag change logging](#feature-flag-change-logging)
* [Cleaning up](#cleaning-up)
# Feature flag controls[](#feature-flag-controls "Permalink")
## Access[](#access "Permalink")
为了能够在 GitLab Inc.提供的任何环境(例如分期和生产)中打开/关闭功能标记后面的功能,您需要访问[Chatops](../chatops_on_gitlabcom.html)机器人. Chatops 机器人当前在 ops 实例上运行,该实例不同于[https://gitlab.com](https://gitlab.com)或[https://dev.gitlab.org](https://dev.gitlab.org) .
按照 Chatops 文档[请求访问权限](../chatops_on_gitlabcom.html#requesting-access) .
一旦您将访问权限传播到项目测试中,请运行:
```
/chatops run feature --help
```
## Rolling out changes[](#rolling-out-changes "Permalink")
将更改部署到环境后,就该开始向我们的用户推出该功能了. 没有具体说明发布更改的确切过程,因为更改之间可能会有所不同. 但是,总的来说,我们建议逐步推出更改,而不是立即为所有人启用更改. 我们还建议您在部署代码*之前* *不要*启用功能. 这使您可以将部署的功能与部署分开,从而更容易分别衡量两者的影响.
GitLab 的功能库(使用[Flipper](https://github.com/jnunemaker/flipper) ,并在[功能标志过程](process.html)指南中进行了介绍)支持向用户发布更改的时间百分比. 依次可以使用[GitLab Chatops](../../ci/chatops/README.html)进行控制.
有关功能标志命令的最新列表,请参见[源代码](https://gitlab.com/gitlab-com/chatops/blob/master/lib/chatops/commands/feature.rb) . 请注意,该文件中的所有示例都必须在`/chatops run`之前.
如果收到错误消息"糟糕! 不允许执行此操作. 该事件将得到报告." 这意味着您的 Slack 帐户不允许更改功能标志,或者您没有[访问权限](#access) .
### Enabling a feature for preproduction testing[](#enabling-a-feature-for-preproduction-testing "Permalink")
作为功能推出的第一步,您应该在[https://staging.gitlab.com](https://staging.gitlab.com)和[https://dev.gitlab.org](https://dev.gitlab.org)上启用功能.
这两个环境具有不同的范围. `dev.gitlab.org`是具有内部 GitLab Inc.流量的生产 CE 环境,用于某些开发和其他相关工作. `staging.gitlab.com`有 GitLab.com 数据库和知识库的较小的子集,并没有正常的交通. 登台是 EE 实例,可以(非常)粗略估计您的功能在 GitLab.com 上的外观/行为. 这两个实例都已连接到 Sentry,因此请确保在启用功能标志后测试功能时,检查那里的项目是否存在异常.
对于这些预生产环境,应在功能相关的阶段在 Slack 通道中运行命令. 例如,将`#s_monitor`通道用于 Monitor 阶段"运行状况"组开发的功能.
To enable a feature for 25% of all users, run the following in Slack:
```
/chatops run feature set new_navigation_bar 25 --dev
/chatops run feature set new_navigation_bar 25 --staging
```
### Enabling a feature for GitLab.com[](#enabling-a-feature-for-gitlabcom "Permalink")
在[预生产](#enabling-a-feature-for-preproduction-testing)环境中成功[启用功能](#enabling-a-feature-for-preproduction-testing)并验证其安全性和正常工作后,您可以将更改发布到 GitLab.com(生产).
#### Communicate the change[](#communicate-the-change "Permalink")
GitLab.com 上的某些功能标志更改应与公司部分进行沟通. 负责开发的人员需要确定这是否必要以及适当的通信级别. 这取决于功能及其可能产生的影响.
作为指导:
* 对于低风险且易于回滚的简单功能,只需继续[在`#production`启用该功能](#process) .
* 对于将影响用户体验的功能,请考虑事先通知`#support_gitlab-com` .
* 对于具有重大下游影响的功能(例如:打开/关闭 Elasticsearch 索引`#production` ),请考虑事先与`#production`协调.
#### Process[](#process "Permalink")
在切换任何功能标志之前,请检查 GitLab.com 上是否没有正在进行的重大事件. 您可以通过检查`#production`和`#incident-management` Slack 通道,或查找[未解决的事件问题](https://gitlab.com/gitlab-com/gl-infra/production/-/issues/?scope=all&utf8=✓&state=opened&label_name[]=incident) (尽管检查日期和时间)来执行此操作.
我们不想在事件发生时进行更改,因为它会使实现事件的诊断和解决变得更加困难,并且由于无法评估发布是否没有问题,因此在很大程度上会使发布过程无效.
如有疑问,请在`#production`中`#production` .
以下`/chatops`命令应在 Slack `#production`通道中执行.
当您开始启用该功能时,请在您执行的第一个`/chatops`命令的 Slack 线程中链接到相关的功能标志发布问题,以便人们可以根据需要了解更改.
要在 25%的时间内启用功能,请在 Slack 中运行以下命令:
```
/chatops run feature set new_navigation_bar 25
```
这将根据以下公式将功能标记设置为`true` :
```
feature_flag_state = rand < (25 / 100.0)
```
这将为 GitLab.com 启用该功能,其中`new_navigation_bar`为该功能的名称. 此命令*不*启用用户总量的 25%的功能. 而是在`enabled?`该功能时进行检查`enabled?` ,它将在 25%的时间内返回`true` .
要为 25%的参与者(例如用户,项目或组)启用功能,请在 Slack 中运行以下命令:
```
/chatops run feature set some_feature 25 --actors
```
这将根据以下公式将功能标记设置为`true` :
```
feature_flag_state = Zlib.crc32("some_feature<Actor>:#{actor.id}") % (100 * 1_000) < 25 * 1_000]
# where <Actor>: is a `User`, `Group`, `Project` and actor is an instance
```
在开发过程中,应根据功能的性质来选择演员.
对于以用户为中心的功能:
```
Feature.enabled?(:feature_cool_avatars, current_user)
```
对于组或名称空间级别的功能:
```
Feature.enabled?(:feature_cooler_groups, group)
```
对于项目级别的功能:
```
Feature.enabled?(:feature_ice_cold_projects, project)
```
如果不确定要使用什么百分比,只需使用以下步骤:
1. 25%
2. 50%
3. 75%
4. 100%
在每个步骤之间,您都需要稍等片刻,并在[https://dashboards.gitlab.net](https://dashboards.gitlab.net)上监视适当的图形. 等待的确切时间可能有所不同. 对于某些功能,几分钟就足够了,而对于其他功能,您可能要等待几个小时甚至几天. 这完全取决于您,只要确保将其清楚地传达给您的团队和生产团队即可,如果您预计任何潜在的问题.
功能门也可以基于`gitlab` ,例如,可以首先仅对`gitlab`项目启用功能. 通过提供`--project`标志来传递项目:
```
/chatops run feature set --project=gitlab-org/gitlab some_feature true
```
对于组, `--group`标志可用:
```
/chatops run feature set --group=gitlab-org some_feature true
```
请注意,基于角色的门适用于百分比. 例如,如果您运行以下两个命令,则将`group/project`视为`gitlab-org/gitlab`并将给定的示例功能视为`some_feature` :
```
/chatops run feature set --project=gitlab-org/gitlab some_feature true
/chatops run feature set some_feature 25 --actors
```
然后将为 25%的参与者同时启用`some_feature` ,并且始终在与`gitlab-org/gitlab`交互时`gitlab-org/gitlab` . 如果特征标记开发使用组参与者,这是一个好主意.
```
Feature.enabled?(:some_feature, group)
```
**注意:**如果要确保用户始终开启或关闭某项功能,则**时间百分比分布**不是一个好主意. 在这种情况下, **"参与者百分比"**展示是一种更好的方法.
最后,要在尽可能多的情况下验证该功能被认为是稳定的,您应该通过运行以下命令**全局**启用该标志来全面推出该功能:
```
/chatops run feature set some_feature true
```
这会将功能标志状态更改为始终**启用** ,从而覆盖上述过程中现有的门(例如`--group=gitlab-org` ).
### Feature flag change logging[](#feature-flag-change-logging "Permalink")
任何影响 GitLab.com(生产)的功能标志更改都会自动记录在问题中.
该问题是在[gl-infra / feature-flag-log](https://gitlab.com/gitlab-com/gl-infra/feature-flag-log/-/issues?scope=all&utf8=✓&state=closed)项目中创建的,它将至少记录启用功能标志的人员的 Slack 句柄,更改的时间和标志的名称.
然后,该问题还将作为注释标记发布到 GitLab 的内部[Grafana 仪表板上](https://dashboards.gitlab.net/) ,以使更改更加明显.
问题格式的更改可以在[Chatops 项目中](https://gitlab.com/gitlab-com/chatops)提交.
## Cleaning up[](#cleaning-up "Permalink")
更改被视为稳定后,请提交新的合并请求以删除功能标记. 这样可以确保所有用户和自我管理实例都可以使用该更改. 确保在此合并请求中添加〜" feature flag"标签,以便发行经理意识到更改隐藏在 feature 标志的后面. 如果必须将合并请求放入一个稳定的分支中,请确保还添加适当的`~"Pick into XY"`标签(例如`~"Pick into 13.0"` ). 有关更多详细信息,请参见[过程文档](process.html#including-a-feature-behind-feature-flag-in-the-final-release) .
从代码库中删除功能门后,数据库中仍然存在该标志也已部署的功能记录. 将 MR 部署到每个环境后,可以删除该记录:
```
/chatops run feature delete some_feature --dev
/chatops run feature delete some_feature --staging
```
Then, you can delete it from production after the MR is deployed to prod:
```
/chatops run feature delete some_feature
```
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