A fix for Wikidata updates had been deployed, and updates should catch up and resume normally soon.
#1Lib1Ref on Wikidata (May 2021) Articles
Title
Chars Added
The sum of characters added to articles by enrolled editors between the start and end dates
References Added
This is the number of reference tags and shortened footnote templates added to articles, and can include multiple references to the same source. The data comes from the reference-counter Toolforge API.
Views
The estimated views to each article since it was first edited, through the most recent stats update. You can use pageviews.toolforge.org to see the exact numbers.