KPIs for navigation changes

Hello all–I’m currently making changes to a website’s global navigation (header and footer) and am wondering what kind of KPIs to track. Would we simply look for an increase in clicks for every page?

Probably not. What’s the purpose of the website? Are there funnels set–up, or paths the user should take to some end? Track that.

If you put google analytics tracking code in every page.
you can see some information about every page 's view in google analytics.
maybe it’s a way to track.