The following list is a compilation of the most frequently collected values:

• Request rates
• Response times
• Error rates
• AJAX calls on web pages (rating, response times, and error rates)
• Exceptions (server and browser exceptions)
• Page views
• Load balancing
• Number of users
• Number of sessions
• Performance counters from your Windows or Linux server (for example, CPU, memory or network usage)
• Host diagnostics for Azure and/or Docker environments
• Diagnostic trace logs
• Custom events or custom metrics (that is, client or server code you write yourself to track business events)

Enough of the theory, let's just take a look at how it works.

Here is a brief demonstration:

1. Open your Azure management portal at https://portal.azure.com.
2. In the navigation area of the portal, click on Monitor. 
3. This opens the Monitor dashboard. In the navigation area of the dashboard, click on Application Insights.
4. Now, a list of existing Application Insights deployments opens. Find one and click in the Name field of the corresponding row.

5. The corresponding dashboard of the deployment opens:

6. Now let's take a look at the selected Application Insights deployment in detail (as a diagram). Click on the Application map button in the navigation area of the dashboard and the diagram opens immediately:

7. Do you want to examine your data instead? Click on the Metrics Explorer button in the navigation area of the dashboard and you can see your metrics charts:

8. In addition to the Metrics Explorer, there are two other options for displaying data. The first is Live Metrics Stream and provides a display in real time:

9. The second is Metrics (preview) and combines with the multiple metrics chart from Azure Monitor:

10. You want to analyze your data in-depth. Click the Analytics button in the top navigation bar of the dashboard:

11. This opens the advanced Analytics portal for Azure Application Insights: