As part of the survey, it would be interesting in order to reduce noise in the data to be able to oversample specific articles, where NavTiming + survey would be recorded more often than others.
NavigationTiming doesn't store article id, but it stores the revision id. For a popular article like https://ru.wikipedia.org/wiki/Россия which is part of the oversampled articles, it gives a recognisable revision id. Last edit was on the 8th, with revision id 96715436. Let's look at how often navtiming was recorded for it on the 9th and on the 10th once per-page oversampling was enabled (mid-day):
|Date||ruwiki navtiming with revId = 96715436|
Which means that the oversampling is working, but the distribution of traffic has such a long tail that boosting these top articles 10x hardly makes a dent in the total sampling numbers.
If we want to speed up data collection for the survey we need to either increase the navtiming oversampling altogether for ruwiki or consider asking another large wiki's community about running the survey.