EDIT 2: I have just read that you are using Google Analytics. I did not realise that was the case when originally reading your question. I think that you should mention this in your question, because it is very different to what I had imagined when originally reading it. In this case, I would most definitely recommend that you have a disclaimer that you are using Google Analytics on your web page. Google Analytics, as others have said, sells data to third parties, that's why the service is free. There's no such thing as a free lunch, as they say. I'd recommend you use something other than Google Analytics to track your downloads. How are you hosting your site? Is it through a paid server, or are you hosting the server yourself? There are plenty of ways that you can analyse how many downloads of your papers are occurring without resorting to Google Analytics.
EDIT: (After received constructive criticism)
I personally do not view it as inappropriate, so long that you are collecting anonymised data, and not logging the IP addresses of individuals who download your papers. If this is the case, you can have a simple message saying "I compile anonymised data relating to the download and view counts of individual papers, to help me determine which of my papers garner greater interest, which guides me to understand which of my topics people are most interested in. I do not log the IP addresses associated with these downloads nor do I log any other personal information." If this is the case, I believe that it is not an invasion of privacy, because you aren't logging who has read your papers.
I find it strange that an individual would state that people would find this inappropriate when it is a standard feature of virtually all cloud hosting services, and (assuming it is anonymous) does not seem to me to constitute an invasion of privacy, because you would not know who any of those people were. Regarding the country of origin, that could be beneficial to know which countries are most interested in your research, which would be relevant for obtaining grants etc. I don't think it would be an invasion of privacy, because countries comprise large numbers of people, and you would not know which people specifically were reading your papers (again, given that you do not track the IP addresses).
/dev/null:-) – R.. GitHub STOP HELPING ICE Jun 25 '23 at 03:12