If you are using any of the above service by google, you may not be knowing that once you activate these features, the default configuration records quality statistics to help improve Gmail voice and video chat.
This means that, when ever you are using any of these services, google is collecting stats as per your usage, so if you want to disable a specific setting in gmail interface, follow the procedure below.
1. Login to gmail.com with your username and password
2. Go to gmail Settings >> Chat and uncheck the option which says Report quality statistics to help improve Gmail voice and video chat as shown in the image below.
3. Click Save Changes button at the bottom center of the gmail settings page to save these settings.