[Telemetry] "Launch links in private tab" toggle

[sblatz]

Description & Product Manager / Data Scientist User Story

• As a product owner, I want to know how often users choose to open links in a Fenix private tab, to understand whether this is a popular use case.

Hypothesis

• We believe this feature is useful to users since this was a key benefit of Firefox Focus.

What questions will you answer with this data?

-How many users enable the Launch in private tab toggle
-How often users launch a link in private tab

What probes (suggested, if applicable)

-User enables "Launch links in private tab" toggle in settings
-User opens a link in private browsing (can we measure this?)

Acceptance Criteria (Added by PM)

• Event pings can be queried via re:dash
• We are sending telemetry events for the actions listed in the requirements
• We have documented the telemetry
• We have asked a data steward to review the telemetry
• NOT an AC: Data science to create dashboard or further graphs (this will be a separate issue, this issue is only about hooking up the events described and that they can be queried in re-dash)

┆Issue is synchronized with this Jira Task

[vesta0]

@sblatz Done! I assume this wasn't already done when Vrushank worked on this feature?

[AndiAJ]

Hi, verified as fixed on the latest Nightly Build #13010606 using a Google Pixel 3a XL (Android 9).

✔️ Disable Open link in a private tab: Ping f6b4cc84-432e-4dfb-aaa9-e5b984b9b99c
✔️ Enable Open link in a private tab: Ping 871bdb4e-2cf0-4919-9841-88648128e05d

✔️Long tap + Open in Browser from Gmail: Ping 15455381-895a-4fa3-866b-4523de2d20da
✔️Action button from a custom tab: Ping 8667eca2-f5a2-4d80-94df-001543540a27
✔️Playstore link: Ping 81dc6bbb-3118-4d42-b90c-e1d264b44cb7

Logcat

Glean dashboard

@sblatz - Please review and re-open if I missed something. 😊