You can enable Google Analytics on your any of your SeamlessDocs and WebForms. Google Analytics will only monitor the traffic on your form.
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To enable Google Analytics:
Select Settings and then choose Advanced from the drop-down menu. Once in the Advanced pop up menu, you will be in the Integrations section. Here you will see a field under Google Analytics to enter your Tracking ID.

Additional support on Google Analytics can be found here: Google Analytics Help Center.