1. SAP Whitepaper: RISE with SAP: Adopting a Clean Core Approach. This document outlines the clean core principle and describes the necessity of tools and dashboards for monitoring extensibility KPIs and custom code footprint. (See Section: "Tools to Support a Clean Core Approach").
2. SAP Help Portal: RISE with SAP Adoption Framework. The framework documentation details the methodology's phases, including governance and operations, where monitoring dashboards are used to track adherence to strategic principles like clean core. (See Section: "Run and Innovate").
3. SAP Community Publication: Clean Core for RISE with SAP S/4HANA Cloud, private edition. This official blog post explains that a key part of the methodology is to "Monitor the compliance of your clean core principles with a dashboard," highlighting the tool's direct purpose. (See Section: "How to achieve a clean core").