Before starting any work, you should ensure developers take a look at your Application Insights data to make sure everything is performing correctly.
Most developers check only this first item before starting their work:

Figure: Tests are green. I'm ready to start work... or am I?
More advanced teams check their application insights data as well. This includes:
See Do you know the daily process to improve the health of your web application?
Figure: Unhandled Exceptions - Is there anything you don't know about here?
See Do you know how to find performance problems with Application Insights?
Figure: Performance - The Server Responses tab shows the slowest running pages.