Add new items to FAQ. Cleanup existing structure. (#477)

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label: "Additional links"
collapsible: true
collapsed: true

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# Local configuration for natural enrollments
---
id: local-enrollment
title: Local configuration for natural enrollments
slug: /local-enrollment
---
## Desktop
Preferences to set in Firefox

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---
id: system-architecture
slug: /system-architecture
---
# System architecture / components
![image](https://user-images.githubusercontent.com/8192232/211682494-7539f5e5-fc2e-43e1-bd82-db151a1906f7.png)
<img style={{border:"1px solid grey"}} title="Nimbus system architecture" src="/img/faq/nimbus-system-architecture.png"/>
[original lives here](https://miro.com/app/board/uXjVOkkueZY=/)
## Experiment Configuration
### Experimenter (AKA Nimbus Console)
This is the interface used by experiment owners and reviewers to capture details about the experiments and the specifics about how to launch it.
This is the interface to start, end enrollment, end, and look at results.
[stage](https://stage.experimenter.nonprod.dataops.mozgcp.net/) and [production](https://experimenter.services.mozilla.com/nimbus/)
### Remote Settings
This is a shared service at Mozilla - that is used to remotely configure the clients.
This is the means of applying experiment changes to the client off-train.
## Client Side
### SDK
Each of the Firefox platforms has an SDK that handles all the experiment operations of targeting, enrolling, bucketing, etc.
The SDK talks to Remote Settings to get the experiment configurations and changes.
### Telemetry
The SDK also generates telemetry on the clients participation in the experiment (state of enrollment, branch, unenrolls).
This and the client telemetry use the applications existing Glean or Legacy Telemetry pipeline.
## Analysis
### Automated Analysis System (AKA Jetstream)
Jetstream runs nightly to automatically analyze the metrics for experiments.
It runs some metrics for every experiment (varies by platform) and can run additional metrics if there are custom configuration files applied to the experiment.
### Custom Configuration (AKA Jetstream Configuration Files)
A data scientist can write a custom configuration file named after the slug of the experiment to add metrics to an experiment.
### Analysis library (MozAnalysis)
Only interfaced with through the data team - this is a repository of vetted metric formulas that can be applied when needed by Data Scientists.
###
Only interfaced with through the data team - this is a repository of vetted metric formulas that can be applied when needed by Data Scientists.

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---
id: desktop-pref-experiments
title: Desktop Pref Experiments
title: Running Pref-setting Experiments on Desktop
slug: /desktop-pref-experiments
---
# Running Pref-setting Experiments on Desktop
As of Firefox 107, Nimbus supports experiments that set preferences on Desktop.
Unlike Normandy, Nimbus cannot set arbitrary preferences; instead, the
preferences that may be set are determined by the feature manifest.

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label: "Custom configs"
collapsible: true
collapsed: true

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---
id: custom-configs
title: Custom configs
slug: /faq/custom-configs
---
### Question
If I create a custom config for an experiment, will I still results still be generated for the primary and secondary outcomes, if I select them? Or will the config completely overwrite those outcomes?
### Answer
You will still get the outcomes even with a custom config.

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label: "Desktop"
collapsible: true
collapsed: true

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---
id: desktop-prefs
title: Desktop prefs
slug: /desktop/desktop-prefs
---
:::tip
See the [deep dive on desktop prefs](/desktop-pref-experiments) for more information
:::
### Question
We were looking to run an experiment in v115 that required setting a pref. We have registered the pref and landed it on beta, but uplifting to release so late may be problematic. Is there any way to make this experiment work in 115 without that update to FeatureManifest.yaml landing?
### Answer
No, the only way to set prefs currently requires them to be registered in the feature manifest.

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---
id: exposure
title: Exposure
slug: /desktop/exposure
---
:::tip
See the [deep dive on growable collections](/cookbook/fml/growable-collections#exposure-events) and [Jetstream enrollment vs. exposure](/jetstream/jetstream/#enrollment-vs-exposure) for more information
:::
### Question
How do I decide whether I want `hasExposure` to be `true`/`false` on desktop? What's the value of these events or the cases where I might/might not want to use them?
### Answer
Exposure events are most valuable when a good proportion of enrolled users wont see the treatment. For example, if seeing the treatment relies on a user action like opening a PDF or using picture in picture.
Sometimes an experiment might have a large impact on the set of users who saw it, but relatively few users did the action to see the treatment. So the “overall” impact of the experiment might be small, but with exposure events we can see that there was indeed a large impact on users who saw the treatment.

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---
id: what-do-it-do
title: What does early startup do?
slug: /what-do-it-do
slug: /early-startup/what-do-it-do
---
:::tip

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label: "Early startup"
collapsible: true
collapsed: true

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---
id: how-early
title: How early is early?
slug: /how-early
slug: /early-startup/how-early
---
## Early on Desktop

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label: "End experiment behavior"
collapsible: true
collapsed: true

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---
id: experiment-end
title: What happens at experiment end?
slug: /experiment-end
slug: /end-experiment-behavior/experiment-end
---
:::tip

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label: "Enrollment"
collapsible: true
collapsed: true

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---
id: re-enrollment
title: Re-enrolled in the same experiment?
slug: /re-enrollment
slug: /enrollment/re-enrollment
---
### Question

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label: "Feature restart"
collapsible: true
collapsed: true

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---
id: how-to-restart
title: Is this supported?
slug: /how-to-restart
slug: /feature-requires-restart/how-to-restart
---
This is how it works when a feature requires a restart:

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label: "Metric availability"
collapsible: true
collapsed: true

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---
id: feature-metrics
title: Feature metrics aren't there?
slug: /feature-metrics
slug: /metric-availability/feature-metrics
---
:::tip

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label: "Mobile"
collapsible: true
collapsed: true

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---
id: mobile-how-to
title: Mobile How-To's
slug: /mobile/mobile-how-to
---
### Question
As a mobile engineer, how do I add a dot release version?
### Answer
* Add a new `Version` to the [constants.py file](https://github.com/mozilla/experimenter/blob/main/experimenter/experimenter/experiments/constants.py) in Experimenter
* Run `make generate_types` to generate the new version in `schema.graphql` and `globalTypes.ts`
* [Example PR](https://github.com/mozilla/experimenter/pull/8870/files)

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label: "Rollouts"
collapsible: true
collapsed: true

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---
id: rollouts-bucketing-warning
title: Rollout bucketing warning
slug: /rollouts/rollouts-bucketing-warning
---
:::tip
See the [Rollout FAQ](/deep-dives/experimenter/rollouts) for general rollout information
:::
### Question
What does this warning mean?
<p/>
<img title="Duplicate bucket warning" src="/img/faq/dupe-rollout-warning.png" align="center"/>
### Answer
If you are using the [multiple-rollout approach](/deep-dives/experimenter/rollouts#without-using-live-editability), this warning can be safely ignored because you are explicitly creating more than one rollout in the same bucket.
However, if you are using [live editability for rollouts](/deep-dives/experimenter/rollouts#live-editability), this warning tells you that there is a rollout that is **already live** that has the same application, channel, feature, and advanced targeting as the rollout that you are creating. This means that there will be collision, and your rollout will not function as-is. Users are already enrolled in the live rollout with the same criteria, and they will not be able to enroll in your rollout.
If you are encountering this and you would still like to proceed with your rollout, feel free to reach out to us in [#ask-experimenter](https://mozilla.slack.com/archives/CF94YGE03) on Slack and we will be able to provide more guidance.

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---
id: rollouts-and-experiments
title: Rollouts and Experiment Interaction
slug: /rollouts-and-experiments
slug: /rollouts/rollouts-and-experiments
---
:::tip
@ -33,12 +33,9 @@ If theyre focused on different fields of the JSON, the behavior the clients g
----
### Question
What does this warning mean?
<p/>
<img title="Duplicate bucket warning" src="/img/faq/dupe-rollout-warning.png" align="center"/>
I have a feature that is now on by default in v115, and I want to wait until it has saturated the user base before shutting off the rollout. Do we have a standard around how long we should keep a rollout going in a situation like this?
### Answer
If you are using the [multiple-rollout approach](/deep-dives/experimenter/rollouts#without-using-live-editability), this warning can be safely ignored because you are explicitly creating more than one rollout in the same bucket. However, if you are using [live editability for rollouts](/deep-dives/experimenter/rollouts#live-editability), this warning tells you that there is a rollout that is **already live** that has the same application, channel, feature, and advanced targeting as the rollout that you are creating. This means that there will be collision, and your rollout will not function as-is. Users are already enrolled in the live rollout with the same criteria, and they will not be able to enroll in your rollout.
We typically wait 1-3 releases for the upgrade tail to catch up. You'll probably have the vast majority, so it just depends on the ramifications if people have it enabled on 114 and then lose it.
If you are encountering this and you would still like to proceed with your rollout, feel free to reach out to us in [#ask-experimenter](https://mozilla.slack.com/archives/CF94YGE03) on Slack and we will be able to provide more guidance.
If it's **not** a big deal, turn off the rollout in 116 and most people will have it and the stragglers will get it when they upgrade. If it **is** a big deal - turn off in 117 or 118 and you'll have reached a few percent more with each release.

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---
id: saturation
title: Rollout feature saturation
slug: /rollouts/saturation
---
:::tip
See the [Rollout FAQ](/deep-dives/experimenter/rollouts) for general rollout information
:::
### Question
I have a feature that is now **on by default** in v115, and I want to wait until it has saturated the user base before shutting off the rollout. Do we have a standard around how long we should keep a rollout going in a situation like this?
### Answer
**Yes**, we typically wait 1-3 releases for the upgrade tail to catch up. You'll probably have the vast majority, so it just depends on the ramifications if people have it enabled on 114 and then lose it.
If it's **not** a big deal, turn off the rollout in 116 and most people will have it and the stragglers will get it when they upgrade. If it **is** a big deal - turn off in 117 or 118 and you'll have reached a few percent more with each release.

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---
id: targeting
title: Targeting dot releases or specific betas
slug: /targeting
---
### Question
Can Nimbus experiments/rollouts target specific beta releases,
ie can I express "roll this out to everyone on 104b6 and later"?*
### Answer
**Yes.** File an issue [here](https://github.com/mozilla/experimenter/issues/new) to add a specific version (of beta, nightly, or release) and then ping in [`#ask-experimenter`](https://mozilla.slack.com/archives/CF94YGE03) on Slack.
The version requested will get added as an option to the Minimum Version and Maximum Version drop down menues. It is a minor and quick change. By default Experimenter (Nimbus) only exposes the whole valued versions, until requested.

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label: "Targeting"
collapsible: true
collapsed: true

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---
id: advanced-targeting
title: Advanced targeting
slug: /targeting/advanced-targeting
---
### Question
How can I add a new advanced targeting option for experiment audiences?
### Answer
To add new advanced targeting you can open a PR against the [`constants.py` file](https://github.com/mozilla/experimenter/blob/main/experimenter/experimenter/targeting/constants.py) in Experimenter. All thats needed is to add a new `NimbusTargetingConfig` object, e.g.:
```python
NEW_ANDROID_13_USERS = NimbusTargetingConfig(
name="New Android 13 Users",
slug="new_android_13_users",
description="Users who have Android 13 and are on their first run of the application",
targeting="(android_sdk_version|versionCompare('33') >= 0) && is_first_run",
desktop_telemetry="",
sticky_required=True,
is_first_run_required=True,
application_choice_names=(Application.FENIX.name,),
)
```
If you need help writing the targeting expression, let us know in [`#ask-experimenter`](https://mozilla.slack.com/archives/CF94YGE03) on Slack.

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---
id: version-targeting
title: Targeting dot releases or specific betas
slug: /targeting/version-targeting
---
### Question
Can Nimbus experiments/rollouts target specific beta releases, i.e. can I express "roll this out to everyone on 104b6 and later"?
### Answer
**Yes.**
If you are a mobile engineer, see steps [here](/mobile/mobile-how-to) for how to add a version.
Otherwise, file an issue [here](https://github.com/mozilla/experimenter/issues/new) to add a specific version (of beta, nightly, or release) and then ping in [`#ask-experimenter`](https://mozilla.slack.com/archives/CF94YGE03) on Slack.
The version requested will get added as an option to the Minimum Version and Maximum Version drop down menues. It is a minor and quick change. By default Experimenter (Nimbus) only exposes the whole valued versions, until requested.

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@ -166,71 +166,14 @@ module.exports = {
]
},
{
type: "category",
label: "Frequently Asked Questions",
items: [
{
"type": "category",
"label": "Early Startup",
"items": [
{
type: 'autogenerated',
dirName: "faq/early-startup",
}
]
},
{
"type": "category",
"label": "End Experiment Behavior",
"items": [
{
type: 'autogenerated',
dirName: "faq/end-experiment-behavior",
}
]
},
"type": "category",
"label": "FAQ",
"items": [
{
"type": "category",
"label": "Feature Requires Restart",
"items": [
{
type: 'autogenerated',
dirName: "faq/feature-requires-restart",
}
]
},
{
"type": "category",
"label": "Metric Availability",
"items": [
{
type: 'autogenerated',
dirName: "faq/metric-availability",
}
]
},
"faq/rollouts-and-experiments",
{
"type": "category",
"label": "Targeting",
"items": [
{
type: 'autogenerated',
dirName: "faq/targeting",
}
]
},
{
"type": "category",
"label": "Unenrollment",
"items": [
{
type: 'autogenerated',
dirName: "faq/unenrollment",
}
]
},
],
type: 'autogenerated',
dirName: "faq",
}
]
},
{
"type": "doc",
@ -241,8 +184,10 @@ module.exports = {
type: "category",
label: "Additional Links",
items: [
"integration-tests",
"local-enrollment",
{
type: 'autogenerated',
dirName: "additional-links",
},
{
type: "link",
label: "Experimenter GH Repo",

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