In general, in cases like this it's worth checking https://wikitech.wikimedia.org/wiki/Analytics/Data_Lake/Traffic/Pageview_hourly#Changes_and_known_problems_since_2015-06-16 (and the other two change/error logs linked there), where this incident was already listed.

On Wed, Jun 20, 2018 at 11:45 PM, Amir E. Aharoni <amir.aharoni@mail.huji.ac.il> wrote:
Hi,

I was browsing Turnilo, and found an odd thing.

Filter by:
1. Time, January 2017 to May 2018
2. Country: Nigeria
3. Project: ig.wikipedia.org

Split by:
Time

Select line chart

You'll immediately notice that there are almost zero pageviews from February 12 until April 15.

What could be the reason?

Thanks!

--
Amir Elisha Aharoni · אָמִיר אֱלִישָׁע אַהֲרוֹנִי
http://aharoni.wordpress.com
‪“We're living in pieces,
I want to live in peace.” – T. Moore‬

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Tilman Bayer
Senior Analyst
Wikimedia Foundation
IRC (Freenode): HaeB