https://sk.wikipedia.org/w/index.php?title=Zoznam_SD_objektov_-19_1-3000?oldid=6558713 (the latest revision as of Feb 23, 2021) has caused a lot of timeouts as seem in logstash.

Unrelated to the question of who / what is retrying that page so much, this task is to investigate the reasons for poor performance on this page.
It basically is a multi-template table with 3000 rows where each row is generated by a template of this form: {{Zoznam BD položka|SD|-19|2759||9,8|9|30|17,2|-19|44,4}}
Worth investigating where in the parsing pipeline this clogs up the pipes.