Add monitoring for per-locale usage
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Mardak commented
#3874 fixed an issue where "id" users had a broken new tab page. @ncloudioj was able to run numbers for nightly "id" users and found recent usage dropping to ~3% of usual levels. When comparing against the usage from 7 days ago (to avoid weekday/weekend cycles), the day when "id" broke saw usage drop by ~40%. And 7 days after first breaking, usage was at ~10%.
We should be able to detect the usage drop within the same day of Nightly updating (?) but maybe by next day or next week would be good enough.
Mardak commented