We had a Kafka outage that caused traffic to look like it dropped. This is purely a bug, no actual drop in traffic was observed. The incident report can be found at https://wikitech.wikimedia.org/wiki/Incident_documentation/20150803-Kafka
date
2015-08-10
start
2015-08-10
end
2015-08-12
title
Kafka Outage
note
We had problems with Kafka that caused traffic to look like it dropped. This was again a bug, no actual drop in traffic was observed. The incident report can be found at https://wikitech.wikimedia.org/wiki/Incident_documentation/20150810-Kafka
date
2015-09-15
title
Better bot detection
note
We improved web crawler detection, which resulted to a lot more pageviews being tagged as 'spider'. This means traffic on vital-signs will appear to drop, sometimes dramatically like in the case of commons. The actual traffic hasn't decreased, we're just categorizing it differently now.
date
2015-11-19
title
Better bot detection
note
We slightly improved web crawler detection, which resulted to some more pageviews being tagged as 'spider'. This means traffic on vital-signs will appear to drop, sometimes dramatically like in the case of Wikidata. The actual traffic hasn't decreased, we're just categorizing it differently now.
date
2016-04-01
start
2016-04-01
end
2016-05-02
title
Bug on App pageviews
note
Artificial decrease of measured app pageviews due to an analytics bug related to the Android app's gradual switch to RESTBase (T132965).
date
2016-07-20
start
2016-07-20
end
2016-08-16
title
Chrome Bug
note
Increase of pageviews of Main_Page due to possible bug in Chrome 41 and windows 10/7 (T141506). We send HTTP 401 since August 16th and that stopped traffic.
date
2021-06-04
start
2021-06-04
end
2022-01-26
title
Traffic data loss due to a number of caching nodes not collecting data
note
See T300164. Global pageviews under reported by 2 to 4% between 4 June and 3 November, and by 5 to 8% between 4 November and 27 January.
date
2021-11-03
start
2021-11-03
end
2021-11-03
title
End of traffic data loss due to a number of caching nodes not collecting data
note
See T300164. Global pageviews under reported by 2 to 4% between 4 June and 3 November, and by 5 to 8% between 4 November and 27 January.
date
2024-05-09
title
Disabled Chrome Private Prefetch Proxy
note
See T364126. Disabled Chrome Private Prefetch Proxy, a Chrome feature which was causing inflated user and automated pageviews.
