2080907 - Add a duration telemetry probe for import/migration resources so we can evaluate current caps

Status: RESOLVED FIXED

(Firefox :: Migration, task, P3)

Description

[Niklas Baumgardner [:niklas]]

The measurement that justified the 2,000-row history cap in 2017 has been deleted, so we cannot safely revisit the cap — which is otherwise close to a one-line pref change with real upside.
Restore a duration probe so Phase 2 can evaluate the cap against its original hang-mitigation rationale. The old probe expired in Fx92 (Mike Conley, bug 1871579), so we've had no import-timing data since 2021.

Full PRD: https://docs.google.com/document/d/1BAoZsE5u7FHXx0mmyogSURJkKHNA8gDhMoD2WuB4WOY/edit?usp=sharing

Comment 1

[Niklas Baumgardner [:niklas]]

Attachment: Bug 2080907 - Add a duration metric for each migration resource. r=#migration,jhirsch

Comment 2

[Jared Hirsch [:jhirsch] (he/him) (Needinfo please)]

(In reply to Niklas Baumgardner [:niklas] from comment #0)

Restore a duration probe so Phase 2 can evaluate the cap against its original hang-mitigation rationale. The old probe expired in Fx92 (Mike Conley, bug 1871579), so we've had no import-timing data since 2021.

Minor correction to the bug description:

The following per-resource timing probes were added in bug 1289436:

• FX_MIGRATION_BOOKMARKS_IMPORT_MS
• FX_MIGRATION_HISTORY_IMPORT_MS
• FX_MIGRATION_LOGINS_IMPORT_MS.

These probes were later not renewed in bug 1714256, although some others were renewed at the time.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/8036d2348e7e
https://hg.mozilla.org/integration/autoland/rev/4ecf99909d14
Add a duration metric for each migration resource. r=jhirsch,mconley

Comment 4

[pstanciu]

https://hg.mozilla.org/mozilla-central/rev/4ecf99909d14