It would depend on what metric you were looking to track and how intrusive you feel would be acceptable to your users.
For example lets assume you want to track if a given user used the app on a given day and for your users you felt a daily welcome screen containing a one click dismiss button was not too intrusive. This screen could be set to appear at midnight each day and would only require a single dismissal per day per user.
To accomplish this you would have to disable the visibility of all tabs based on the user not yet dismissing the “daily welcome page” which would then force the user to interact with the welcome page prior to gaining access to the rest of the app.
To accomplish this, it would likely require either a form (as mentioned above) which would be more intrusive (as it would require a welcome page and a redirect to the form and a filling out of the form), or you could use some user owned rows to track the “click” (with an increment action for instance).
The caveat to all of this is you would have to likely use some AppScript (the google sheet equivalent to Excels Macros) to both add each day’s “click” to the user specific tally and also reset each “click” a the start/end of each day.