Profiles with more than one first_run_date in the first session ping

[lucia-vargas-a]

Steps to reproduce

Querying the number of first_run_date per client_id in the first session ping returns more than one value.

WITH first_runs AS
(
  SELECT
    client_info.client_id, COUNT(1) AS dates
  FROM
    `moz-fx-data-shared-prod.org_mozilla_firefox_stable.first_session_v1`
  WHERE
  DATE(submission_timestamp) >= '2021-01-01'
  AND DATE(submission_timestamp) = SAFE.PARSE_DATE('%F', SUBSTR(client_info.first_run_date, 1, 10))
  AND ping_info.seq = 0
  GROUP BY 1
)
SELECT
  COUNT(client_id) clients,
  COUNT(IF(dates>1, client_id, NULL)) AS clients_with_many_first_run_date
FROM first_runs
WHERE dates>1

Expected behaviour

Each client_id has a single first_run_date in moz-fx-data-shared-prod.org_mozilla_firefox_stable.first_session_v1 and a unique seq.
The code will only send the ping if it hasn't been sent yet.

Actual behaviour

There are 226 profiles with more than one first_session date and same seq between 2021 and 2022. (see query above)

Device name

NA

Android version

NA

Firefox release type

Firefox

Firefox version

NA

Device logs

NA

Additional information

This is related to a Glean first session ping.

┆Issue is synchronized with this Jira Task

[kbrosnan]

I expect this is people that override our blocking of Android backup. This requires root.

[chutten]

Seems plausible, as the proportions we're seeing aren't inconsistent with such a niche population. Is there a way we could confirm by detecting their override, @kbrosnan ?

[kbrosnan]

We don't have data on if the user is rooted.

[chutten]

Is it possible to instrument? I might dust off my Javalike language skills and implement such instrumentation if it'd give us confidence. But I don't know Android well enough to know if things like this will get us what we need.

[kbrosnan]

Yes it is possible. Opened the above issue to look into collecting that data. It would be a few months before this hits release users.

[csadilek]

Moved to bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1809326

Change performed by the Move to Bugzilla add-on.