Marlon Ribunal demonstrates how to build a widget in SQL Operations Studio:
This is where SQL Operations Studio (SOS) comes in the picture. SOS is a lightweight, cross-platform client. It is also open-source. Aside from its IDE functionalities, SOS has a lot of more offerings for DBAs, Devs, and DevOps. One of these is that you can use it as a dashboard to monitor your databases. SSMS comes with standard reports as well as custom reports using Report Definition Language or RDL (which is essentially an SSRS-like report residing in SSMS). SQL Operations Studio raised the bar in this regard. You can create multiple widgets to display on your dashboard.
Click through for a demonstration and screen shots.