App1 is an .NET application You need to recommend monitoring of APP1

The .NET Application Performance Monitoring template in the Authoring pane generates the necessary monitors and rules to instrument a .NET application, capturing exceptions, slow transactions, and performance counters without requiring code changes - it is the designated SCOM feature specifically designed for .NET APM monitoring.

Installing a web application monitor is a separate SCOM feature for HTTP availability and transaction testing of web URLs, not for instrumenting .NET application internals.

Configuring a web application monitor from the Operations Manager console tests HTTP-level availability and response times, not .NET exception monitoring.

A web transaction monitor tests scripted browser interactions against web pages and does not provide .NET runtime exception or performance monitoring.