Out of 26 projects my main system is watching, 6 of them have what I assume is google tracking code.

I discovered this by using find /i "google-analytics" mas*.xml in the boinc data folder

The 6 projects are:

Cas
Nfs
Universe
Cosmology
Gpugrid
Milkyway

for example:

---------- MASTER_WWW.GPUGRID.NET.XML
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

I assume they signed up for this and get some compensation


FWIW, According to https://www.similarweb.com/website/boinc.berkeley.edu SETI is the biggest traffic referral to Boinc at Berkeley,. My guess is they are looking for ET both at SETI and at Berkeley. They will definitely find some at Berkeley.

Maybe this tracking code was added by my computer and not the project?

My guess is they are looking for ET both at SETI and at Berkeley.

Yes - they are searching for ET everywhere, and quite a lot of it happens at Berkeley.

https://seti.berkeley.edu/ summarises how some of it hangs together: SETI@Home is just one part of the overall operation.

Note that the SETI Institute, based in Mountain View, is not part of the Berkeley (University of California) operation.

Isn't Google.com one of the communication verification checks in the client? You see if it being checked with the http_debug flag in the Events Log when there is a communication error.
For example in:
network_test_url = "https://www.google.com/";
Correct?

It seems to get used a lot in the client code, drupal code or recaptcha code.