Perform the following steps:
- If you are using the Power BI portal for the first time, you might have to click on Skip on the welcome page, as shown in the following screenshot:

- The next step is to create a streaming dataset by clicking on Create and then choosing Streaming dataset, as shown in the following screenshot:

- In the New streaming dataset step, select API and click on the Next button, as shown in the following screenshot:

- In the next step, you need to create the fields for the streaming dataset. Provide a meaningful name for the dataset and provide the values that you would like to push to Power BI. For this recipe, I have created a dataset with just one field, named RequestsPerSecond, of type Number and clicked on Create, as shown in the following screenshot:

- Once you create the dataset, you will be prompted with a Push URL, as shown in the following screenshot. You will use this Push URL in Azure Functions to push the RequestsPerSecond data every second (or according to your requirements) with the actual value of requests per second. Click on Done:

- The next step is to create a dashboard with a tile in it. Let's create a new dashboard by clicking on Create and choosing Dashboard, as shown in the following screenshot:

- In the Create dashboard popup, provide a meaningful name and click on Create, as shown in the following screenshot, to create an empty dashboard:

- In the empty dashboard, click on the Add tile button to create a new tile. Clicking on Add tile will open a new popup, where you can select the data source from which the tile should be populated:

- Select Custom Streaming Data and click on Next, as shown in the preceding screenshot. In the following step, select the Requests dataset and click on the Next button:

- The next step is to choose Visualization Type (it is Card in this case) and select the fields from the data source, as shown in the following screenshot:

- The final step is to provide a name for your tile. I have provided RequestsPerSecond. The name might not make sense in this case. But you are free to provide any name as per your requirements.