Logging with Application Insights

One of the most important operational requirements for software is that your company understand what the application is doing and can triage responses to errors. This is generally achieved via some form of logging, and there is a service in Azure for this, called Application Insights. It's a very sophisticated application health monitoring tool that combines out-of-the-box monitoring, like processor loads, RAM usage, and errors, with specific logging that the developer has to implement. While Azure Functions don't really have concerns with processor loads or RAM usage, it useful to know the average length of calls, how many instances are being spun up, and hourly spend.

In the next example, you will add Azure Application Insights integration to your previous two functions, to enable effective support.

...