Just found out the drop was caused by more bots checking in ArticleHandler in 2.3.7+Bug 7681 Patch
Since the view counts and Counter statistics are checking the same bots now, will their statistics number be identical? But View counts are still much more than Counter for our October stats, is it because the following code in Counter?:
if ( $lastRequestGap < 10 ) return false;
// if last request was less than 30 seconds ago AND is PDF then return without recording this view
if ( $galley->isPdfGalley() && ($lastRequestGap < 30) ) return false;
What's the real benefit for the above code? If it makes the stats more accurate, why not add it for View counts?
And I am also curious what statistics is your institution using? Counter or View counts in article_galleys? Or both like us? Or anything else?