Visibility into complex distributed systems is crucial for modern technology operations. Despite promises, the configuration management database (CMDB) and its discovery tools never delivered visibility into system relationships. However, other solutions, such as application performance management (APM) tools, AI for IT operations (AIOps), machine learning (ML), and distributed tracing, have gained maturity. Collectively, these solutions deliver a modern application and infrastructure dependency mapping (AIDM) reality. This report helps infrastructure and operations (I&O) pros understand the value, available solutions, and limitations of AIDM.