Citrix Studio tries to upload data to Google Analytics (POST http://www.google-analytics.com/collect HTTP/1.1).

Third-Party Security tools detect this traffic and may show the alert. 

Example from Vector Security Network Cybersecurity Tool:

Citrix Studio is attempting to connect to Google Analytics website https://www.google-analytics.com

POST http://www.google-analytics.com/collect HTTP/1.1

Content-Type: application/x-www-form-urlencoded

User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 10.0

Host: www.google-analytics.com

Content-Length: 204

Expect: 100-continue

Alerts cease when the Studio console is closed and resumes upon relaunching the Citrix Studio.

Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

To disable the collection of Google analytics data, update following setting in the registry on the machine where Citrix Studio is installed:

1. Open Registry Editor (regedit).
2. Navigate to registry Path: HKLM\Software\Citrix\DesktopStudio
3. Edit the value for following DWORD value: "GAEnabled".
4. Set the value to '0'. A value of 1 enables collection and upload, and a value of 0 disables collection and upload.

Problem Cause

Google Analytics are collected (and later uploaded) automatically when you install (or upgrade) Citrix Studio.

Citrix Virtual Apps and Desktops - Citrix Studio is attempting to connect to Google Analytics

https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/install-configure/install-prepare.html#during-installation-of-any-component

Google Analytics has been deprecated for Web Studio.