Why is the "Apm Insight keys" text box disabled?

Why is the "Apm Insight keys" text box disabled?

The "APM Insight keys" text box, in AppFilter tab, will be disabled in the following scenarios:

  • The application is not selected for monitoring

  • The APM Insight .NET Agent windows service is running. In this case, stop the agent service and re-open the "Edit configuration" dialog.