The iOS app's daily active users suddenly dropped last week. Either the new version is very unpopular... or something went wrong with the counting logic ;)
@Mhurd is going to look into this next week to see if it's something the iOS team can fix.
mobile_apps_uniques_monthly might be affected as well.
Data source for the above:
SELECT CONCAT(year,"-",LPAD(month,2,"0"),"-",LPAD(day,2,"0")) as date, unique_count AS iOS_DAU FROM wmf.mobile_apps_uniques_daily WHERE platform = 'iOS';