It is often useful to focus on sites that have open alerts.  This article will walk you through the creation of a dynamic group that will always contain sites with open alerts.  Setting up a group in this manner will result in a group that always contains sites with open alerts and dynamically changes when alerts open or close.

From the Overview page, click on the filter icon to the right of the search bar.

Next, check off the alert types that you want the group to include.  In this example, we want to see all sites with any/all types of open alerts, and select all of the alert types.  

Finally, name the group with something that is identifiable "Sites w Alerts" and click the "Add" button at the bottom of the sidebar.
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Now, you will have a group "Sites w Alerts" that can be accessed throughout the rest of the platform making it easy to stay focused on only those sites with open alerts as you go about your workflows.  

The help article on Dashboards provides information on creating custom solutions.