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Dramatic decrease of tracking by a small pic

Only 21% from last year value

     
6:33 am on Sep 2, 2017 (gmt 0)

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WebmasterWorld Senior Member jetteroheller is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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I have a javascript which loads an small image from the subdomain log.MY_SITE
At the load, in the ?..... are all interesting parameters.

The traffic remained at the same level, only the tracking decreased much:
From August 2016 to July 2017 to 56%

But in August, only 21% as many entries as August 2016.

What happens? How to track better?
9:12 am on Sept 2, 2017 (gmt 0)

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WebmasterWorld Administrator ianturner is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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I'm guessing it is ISPs caching the small pic. You could generate a unique filename in a set directory for each page view and track the hits for the directory.
12:31 am on Sept 3, 2017 (gmt 0)

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WebmasterWorld Senior Member jetteroheller is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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Just for September 2nd by GMT+1 this.MY_SITE

l.png?all-loging-data in log.MY_SITE 76
cgi-bin/js.pl?all-loging-data in this.MY_SITE 158
Google Analytics for this.MY_SITE 95 sessions with 2.29 average page views makes 217
Google AdSense first ad block on each page: 151
9:55 am on Sept 3, 2017 (gmt 0)

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WebmasterWorld Senior Member jetteroheller is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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Just compare with 1. September 2016

490 tracked by small img on log.MY_SITE
165*2,45= 404 page views by Google Analytics
335 Google AdSense first ad block on each page

So one year ago, the tracking img showed more page views than Google Analytics or Google AdSense.
The situation changed to the tracking img shows far less than Google Analytics or Google AdSense.