Application Insights is a service in Microsoft Azure for Application Performance Monitoring. See more here: https://azure.microsoft.com/en-us/services/application-insights/ .
I’ve previously (1, 2, 3) posted about Application Insights when it was part of Visual Studio Online. It has been moved to the Azure portal, and now has a slightly different API.
It can be used to detect crashes, tracks performance issues and usage of mobile apps, web apps and more.
I’ve used it on a few web sites hosted in IIS or on Azure, and it works great.
For ASP.net web sites, it’s really easy to set up and get going. There the VS2015 integration to it makes it really seamless, and if you can follow a few wizard steps, there is no additional setup needed.
However, if you don’t have a mobile app, an ASP.net site on Azure or local IIS or a J2EE application, then there are no wizards, and no easy setup.
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