Salsa pages can be tracked similarly to how you track your own site's pages by inserting the Google source into your Salsa templates. Google Analytics will track each page individually whenever your tracking code is applied to it. If you apply it to your template, then Google will track all the pages where that template is applied. If you have trouble, this documentation may be helpful:
When you add it to your template, we recommend adding it before the </body> tag towards the bottom of your template so that your pages load most efficiently.