[FF] vue3_migrate_compliance_center -- Vue 3 compat mode for compliance center
## Summary
This issue is to roll out [the feature](https://gitlab.com/gitlab-org/gitlab/-/work_items/589152) on production,
that is currently behind the `vue3_migrate_compliance_center` feature flag.
## Owners
- Most appropriate Slack channel to reach out to: `#g_compliance`
- Best individual to reach out to: @xanf
## Expectations
### What are we expecting to happen?
The compliance center pages (group and project) will render using Vue 3 compat mode instead of Vue 2. All existing functionality should work identically.
### What can go wrong and how would we detect it?
Compliance center pages could break or render incorrectly. This would be detected through error rates on Sentry and user reports. The feature flag acts as a kill switch — enabling it reverts to Vue 2.
## Rollout Steps
Note: Please make sure to run the chatops commands in the Slack channel that gets impacted by the command.
### Rollout on non-production environments
- Verify the MR with the feature flag is merged to `master` and has been deployed to non-production environments with `/chatops gitlab run auto_deploy status <merge-commit-of-your-feature>`
- [ ] Enable the feature globally on non-production environments with `/chatops gitlab run feature set vue3_migrate_compliance_center true --dev --pre --staging --staging-ref`
- [ ] Verify that the feature works as expected.
The best environment to validate the feature in is [`staging-canary`](https://about.gitlab.com/handbook/engineering/infrastructure/environments/#staging-canary) as this is the first environment deployed to. Make sure you are [configured to use canary](https://next.gitlab.com/).
- [ ] If the feature flag causes end-to-end tests to fail, disable the feature flag on staging to avoid blocking [deployments](https://about.gitlab.com/handbook/engineering/deployments-and-releases/deployments/).
### Before production rollout
- [ ] If the change is significant and you wanted to announce in [#whats-happening-at-gitlab](https://gitlab.enterprise.slack.com/archives/C0259241C), it best to do it before rollout to `gitlab-org/gitlab-com`.
### Specific rollout on production
For visibility, all `/chatops` commands that target production must be executed in the [`#production` Slack channel](https://gitlab.slack.com/archives/C101F3796)
and cross-posted (with the command results) to the responsible team's Slack channel.
- Ensure that the feature MRs have been deployed to both production and canary with `/chatops gitlab run auto_deploy status <merge-commit-of-your-feature>`
- [ ] Depending on the [type of actor](https://docs.gitlab.com/development/feature_flags/#feature-actors) you are using, pick one of these options:
- For **group-actor**: `/chatops gitlab run feature set --group=gitlab-org,gitlab-com vue3_migrate_compliance_center true`
- [ ] Verify that the feature works for the specific actors.
### Preparation before global rollout
- [ ] Set a milestone to this rollout issue to signal for enabling and removing the feature flag when it is stable.
- [ ] Check if the feature flag change needs to be accompanied with a
[change management issue](https://about.gitlab.com/handbook/engineering/infrastructure-platforms/change-management/#feature-flags-and-the-change-management-process).
Cross link the issue here if it does.
- [ ] Ensure that you or a representative in development can be available for at least 2 hours after feature flag updates in production.
If a different developer will be covering, or an exception is needed, please inform the oncall SRE by using the `@sre-oncall` Slack alias.
- [ ] Ensure that documentation exists for the feature, and the [version history text](https://docs.gitlab.com/development/documentation/feature_flags/#add-history-text) has been updated.
- [ ] Notify the [`#support_gitlab-com` Slack channel](https://gitlab.slack.com/archives/C4XFU81LG) and your team channel ([more guidance when this is necessary in the dev docs](https://docs.gitlab.com/development/feature_flags/controls/#communicate-the-change)).
### Global rollout on production
For visibility, all `/chatops` commands that target production must be executed in the [`#production` Slack channel](https://gitlab.slack.com/archives/C101F3796)
and cross-posted (with the command results) to the responsible team's Slack channel.
- [ ] [Incrementally roll out](https://docs.gitlab.com/development/feature_flags/controls/#process) the feature on production.
- Example: `/chatops gitlab run feature set vue3_migrate_compliance_center <rollout-percentage> --actors`.
- Between every step wait for at least 15 minutes and monitor the appropriate graphs on https://dashboards.gitlab.net.
- [ ] After the feature has been 100% enabled, wait for [at least one day before releasing the feature](#release-the-feature).
### Release the feature
After the feature has been [deemed stable](https://about.gitlab.com/handbook/product-development-flow/feature-flag-lifecycle/#including-a-feature-behind-feature-flag-in-the-final-release),
the [clean up](https://docs.gitlab.com/development/feature_flags/controls/#cleaning-up)
should be done as soon as possible to permanently enable the feature and reduce
complexity in the codebase.
- [ ] Create a merge request to remove the `vue3_migrate_compliance_center` feature flag. The MR should include the following changes:
- Remove all references to the feature flag from the codebase.
- Remove the YAML definitions for the feature from the repository.
- [ ] Ensure that the cleanup MR has been included in the release package.
- [ ] Close [the feature issue](https://gitlab.com/gitlab-org/gitlab/-/work_items/589152) to indicate the feature will be released in the current milestone.
- [ ] Once the cleanup MR has been deployed to production, clean up the feature flag from all environments by running these chatops command in `#production` channel: `/chatops gitlab run feature delete vue3_migrate_compliance_center --dev --pre --staging --staging-ref --production`
- [ ] Close this rollout issue.
## Rollback Steps
- [ ] This feature can be disabled on production by running the following Chatops command:
```
/chatops gitlab run feature set vue3_migrate_compliance_center false
```
- [ ] Disable the feature flag on non-production environments:
```
/chatops gitlab run feature set vue3_migrate_compliance_center false --dev --pre --staging --staging-ref
```
- [ ] Delete feature flag from all environments:
```
/chatops gitlab run feature delete vue3_migrate_compliance_center --dev --pre --staging --staging-ref --production
```
issue