What was the Google 'update' on 31st March?

[RobFD]

Hi all. I looked back and saw that there was an update shown in 'Search Analytics' in Webmaster Tools a few weeks before the Mobile algorithm update.

Not been able to find any mention of it and what it did so thought I'd check in here.

ps. Also, this is a 90 day stretch and shows that our rankings have taken a hit since the mobile algorithm update. Interesting stuff (see image below)

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[Mustansar]

I also noticed the update by google but have no idea about what was it.

let see to if there is any other information come across.

[FathomMarketing]

I was wondering that, too. Details here:

https://support.google.com/webmasters/answer/6211453#search_analytics

A logging error incorrectly reported a drop in impressions and clicks. No actual drop occurred.

[MattAntonino]

I'd been asking about this on Twitter all week with no response.  Thanks for the link; that really helps!