This issue is caused by usual hidden bot traffic. I link this task as a subtask of T138207.

Hive query:

SELECT
  user_agent_map,
  SUM(view_count)
FROM wmf.pageview_hourly
WHERE year = 2016
  AND month = 10
  AND project = 'eu.wikipedia'
  AND page_title = 'Teratologia'""").registerTempTable("eu")
GROUP BY
user_agent_map;

Result: [Windows XP,-,-,6,IE,Other,-,11307]

In this case i think mediawiki might be retuning 200 to a non existing page, correct? For us to be counting these as pageviews

I am sorry we didi not looked at this earlier. Page got created December 7th, so pageviews before then are likely from edit/preview requests (we had a bug that counted those). See: https://phabricator.wikimedia.org/T156628

The UA responsable for those pageviews is : {"browser_major":"6","os_family":"Windows XP","os_major":"-","device_family":"Other","browser_family":"IE","os_minor":"-","wmf_app_version":"-"} which is responsible for 19000 pageviews on that page, that points to bot traffic and probably a bogus UA (hard to say). That doesn't mean that traffic is not real, it is, but it is automated. Our top computation is really not reliable when it comes to "human" traffic as it is affected by bot traffic of bots that are not self-reported as such. This is something we hope to solve in the upcoming year.