Classic Application Insights Is On Its Way Out!
As of the 29th of February 2024, classic application insights will be deprecated. This means you need to switch any classic instances over to Workspace-based instances, which will use a Log Analytics workspace to store the data rather than within App Insights itself. If you use Application Insights, check which mode your workspaces are using.
There is a migration process to switch your workspace over, and it is pretty straightforward: