APM is not merely an end-user monitoring application. APM is part of the IT infrastructure and the use of the tools that is divided over many stakeholders. The following diagram is an APM reference architecture that incorporates best practices, standards and learning from the past engagements.

These are the different areas of the landscape that are monitored through a combination of various tools. Finally, the significant bit is correlating the information from different sources within the application landscape and is required for the single glass pane view for an enterprise which is also part of the ASM tools monitoring scope: