This already exists inside the default Zendesk Support dashboard in Explore. You'll just be looking for number of tickets created V solved on the Tickets tab inside this dashbaord.
This is great. Thank you. How can I change this to use a filter instead of the entire instance? We are a segment of our support and only want to capture our vertical vs. the entire org.
There are basic filters on the dashboard you can use. Short of that, you'd need to look at building a custom dashboard with reports and filters to achieve something that might be more dedicated to your support team's needs.