# What happened on April 2017?

I used the query in this answer to see the number of edits per month and I was fairly surprised as April 2017 had $$86,444$$ edits.

The graph of edits per day is even more surprising as one day had $$55, 073$$ edits, though I am unable to pinpoint the exact date! I am vey surprised because referring back to the graph per month, the second most edits in a month was $$33, 740$$ edits on November 2015.

Is this a random event or a processing error? Or did something occur so that so many edits took place (retagging, etc)? Or is this a problem in the query?

This, I think, is the move to https links, where all the links which point to SE were silently edited in the background from http to https.