How do I use Azure application insights?

Monitor:

Install Application Insights in your app, set up availability web tests, and:

• Check out the default application dashboard for your team room to keep an eye on load, responsiveness, and the performance of your dependencies, page loads, and AJAX calls.
• Discover which is the slowest and most failing requests.
• Watch Live Stream when you deploy a new release, to know immediately about any degradation.

Detect, Diagnose:

When you receive an alert or discover a problem:

• Check how many users are affected.
• Correlate failures with exceptions, dependency calls, and traces.
• Check out profilers, snapshots, stack dumps, and trace logs.

Build Measure, Learn: 

Measure the effectiveness of each new feature that you deploy.

• Plan to measure how the customers are using new UX or business features.
• Write custom telemetry into your code.
• Establish the next development cycle on hard evidence from your telemetry.