For information on changes to the API, see the Changelog.
The Application Insights REST API is in
Use the Application Insights REST API
to build custom solutions
Query and integrate with the performance, availability and usage data collected by Application Insights for your application
Access all your app's event and metric data with a powerful and simple REST API
Easily integrate your data into other data query and visualization products such as Power BI, Excel and others
Learn to use the API with an interactive API Explorer and either your own data, or a demo application