When using Quarry to retrieve data from Mediawiki database tables, no data after 20170517193000 is available in the recentchanges, revision or logging tables for several databases xxwiki_p (where xx = sv, fi, no, nl, pl, tr, it, pt, ...).
From other databases like yywiki_p (where yy=en, de, ft, es, da, ru, et, la, lt, lv, nn, rp, ceb, ja ...) data is available as usual.

SQL:
use svwiki_p;
SELECT NOW(), rc_timestamp FROM recentchanges
ORDER BY rc_timestamp DESC
LIMIT 5

just gives this

NOW(),rc_timestamp
2017-05-18T22:54:38,20170517192932
2017-05-18T22:54:38,20170517192932
2017-05-18T22:54:38,20170517192932
2017-05-18T22:54:38,20170517192921
2017-05-18T22:54:38,20170517192921

i.e. data for more than 27 hours is missing.

Edit:
It seems the databases are now gradually being updated. (I only checked the svwiki_p table recentchanges)
15 minutes ago the most recent data was 16.1 hours old and right now the most recent data is 14.6 hours old.
With that pace the "catch up" will be completed and the function back to normal in 2-3 hours time.

It would be interesting to know why this affected some language versions but not other.