[FF] `email_based_mfa` -- Email-based one time passwords feature
<!-- Title suggestion: [FF] `<feature-flag-name>` -- <short description> -->
:mega: **Are you looking for a place to give feedback?** https://gitlab.com/gitlab-org/gitlab/-/work_items/553307+s
## Summary
This issue is to roll out [the feature](https://gitlab.com/groups/gitlab-org/-/epics/17128) on production,
that is currently behind the `email_based_mfa` feature flag.
## Owners
- Most appropriate Slack channel to reach out to: `#mfa_default_planning`
- Best individual to reach out to: @nmalcolm
- Alternatively, anyone from `@gitlab-com/gl-security/product-security/product-security-engineering, @kimwaters, or @estrike`
## Expectations
### What are we expecting to happen?
- Users who use a password to sign in can opt-in to the Email-based OTP feature
- Users who are enrolled in Email-based OTP:
- cannot complete their sign in unless they enter a code sent via email
- cannot use passwords to authenticate to APIs; consistent with existing 2FA restrictions (Git over HTTPs, Container Registry / docker login)
### What can go wrong and how would we detect it?
Enabling the FF does not enrol users in Email MFA in and of itself; that will happen via Change Requests updating production data.
This change is being rolled out with a lot of eyes on it, using https://gitlab.com/gitlab-org/gitlab/-/issues/566615+s.
Because of this, it is expected that nothing will go wrong _due to enabling the FF_.
## 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
See dedicated issue: https://gitlab.com/gitlab-org/gitlab/-/issues/582228+s
### 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 run auto_deploy status <merge-commit-of-your-feature>`
- [x] Depending on the [type of actor](https://docs.gitlab.com/ee/development/feature_flags/#feature-actors) you are using, pick one of these options:
- For **user-actor**: `/chatops run feature set --user=<gitlab-username-of-dri> email_based_mfa true`
- For **all internal users**: `/chatops run feature set --feature-group=gitlab_team_members email_based_mfa true`
- [x] Verify that the feature works for the specific actors.
### Preparation before global rollout
- [x] 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.
- Enabling the FF has no effect. Rolling it out will, and has a CR here: https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21002+s and later rollout steps organised via https://gitlab.com/gitlab-org/gitlab/-/issues/566615+s
- [x] 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.
- [x] 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.
- https://gitlab.com/gitlab-org/gitlab/-/issues/570175+s
- [x] Ensure that any breaking changes have been announced following the [release post process](https://about.gitlab.com/handbook/marketing/blog/release-posts/#deprecations-removals-and-breaking-changes) to ensure GitLab customers are aware.
- https://gitlab.com/gitlab-org/gitlab/-/issues/566623#note_2961874939
- https://gitlab.com/gitlab-com/Product/-/issues/14312+s
- [x] 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.
- [x] [Incrementally roll out](https://docs.gitlab.com/development/feature_flags/controls/#process) the feature on production.
- Example: `/chatops run feature set email_based_mfa <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).
#### Graphs
- [Email OTP Rollout Dashboard](https://log.gprd.gitlab.net/app/dashboards#/view/9c98d4a6-78f0-4124-87e3-055cf88e89df) (expect nothing because users won't have opted in)
- [`json.controller : "ProfilesController"` Elastic logs](https://log.gprd.gitlab.net/app/r/s/9xiGt) (expect no changes; same rate of 200s + same rate of non-200s)
- [`stage:main feature_category:user_profile` in Sentry](https://new-sentry.gitlab.net/organizations/gitlab/issues/?environment=gprd&project=3&query=+stage%3Amain+feature_category%3Auser_profile&referrer=issue-list&statsPeriod=1h) (expect no new errors)
### (Optional) Release the feature with the feature flag
**WARNING:** This approach has the downside that it makes it difficult for us to
[clean up](https://docs.gitlab.com/development/feature_flags/controls/#cleaning-up) the flag.
For example, on-premise users could disable the feature on their GitLab instance. But when you
remove the flag at some point, they suddenly see the feature as enabled and they can't roll it back
to the previous behavior. To avoid this potential breaking change, use this approach only for urgent
matters.
<details><summary>See instructions if you're sure about enabling the feature globally through the feature flag definition</summary>
If you're still unsure whether the feature is [deemed stable](https://about.gitlab.com/handbook/product-development-flow/feature-flag-lifecycle/#including-a-feature-behind-feature-flag-in-the-final-release)
but want to release it in the current milestone, you can change the default state of the feature flag to be enabled.
To do so, follow these steps:
- [ ] Create a merge request with the following changes.
- [ ] If feature was enabled for various actors, ensure the feature has been enabled globally on production `/chatops run feature get email_based_mfa`. If the feature has not been globally enabled then enable the feature globally using: `/chatops run feature set email_based_mfa true`
- [ ] Set the `default_enabled` attribute in [the feature flag definition](https://docs.gitlab.com/ee/development/feature_flags/#feature-flag-definition-and-validation) to `true`.
- [ ] Decide [which changelog entry](https://docs.gitlab.com/ee/development/feature_flags/#changelog) is needed.
- [ ] Ensure that the default-enabling MR has been included in the release package.
If the merge request was deployed before [the monthly release was tagged](https://about.gitlab.com/handbook/engineering/releases/#self-managed-releases-1),
the feature can be officially announced in a release blog post: `/chatops run release check <merge-request-url> <milestone>`
- [ ] After the default-enabling MR has been deployed, clean up the feature flag from all environments by running these chatops command in the `#production` channel: `/chatops run feature delete email_based_mfa --dev --pre --staging --staging-ref --production`
- [ ] Close [the feature issue](<feature-issue-link>) to indicate the feature will be released in the current milestone.
- [ ] Set the next milestone to this rollout issue for scheduling [the flag removal](#release-the-feature).
- [ ] (Optional) You can [create a separate issue](https://gitlab.com/gitlab-org/gitlab/-/issues/new?issuable_template=Feature%20Flag%20Cleanup) for scheduling the steps below to [Release the feature](#release-the-feature).
- [ ] Set the title to "[FF] `email_based_mfa` - Cleanup".
- [ ] Execute the `/copy_metadata <this-rollout-issue-link>` quick action to copy the labels from this rollout issue.
- [ ] Link this rollout issue as a related issue.
- [ ] Close this rollout issue.
</details>
### 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.
You can either [create a follow-up issue for Feature Flag Cleanup](https://gitlab.com/gitlab-org/gitlab/-/issues/new?issuable_template=Feature%20Flag%20Cleanup)
or use the checklist below in this same issue.
<!-- The checklist here is to help stakeholders keep track of the feature flag status -->
- [ ] Create a merge request to remove the `email_based_mfa` feature flag. Ask for review/approval/merge as usual. 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.
If the merge request was deployed before [the monthly release was tagged](https://about.gitlab.com/handbook/engineering/releases/#self-managed-releases-1),
the feature can be officially announced in a release blog post: `/chatops run release check <merge-request-url> <milestone>`
- [ ] Close [the feature issue](<feature-issue-link>) 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 run feature delete email_based_mfa --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 run feature set email_based_mfa false
```
- [ ] Disable the feature flag on non-production environments:
```
/chatops run feature set email_based_mfa false --dev --pre --staging --staging-ref
```
- [ ] Delete feature flag from all environments:
```
/chatops run feature delete email_based_mfa --dev --pre --staging --staging-ref --production
```
issue