Creating a CMDB Integration: Video Series
In this video series, I walk through a process similar to how we at ServiceNow create Service Graph Connectors (SGC). The SGC program is very structured with certain standards and architectural requirements, so these videos don't follow all of those exactly (I don't create a navigation menu, ATF tests, a guided setup, or some of the other things that make a SGC a SGC), but my hope is that you will see most of the tooling and process to build a proper CMDB integration.
The Pre-build Work
Part 1: Understanding the data source
Part 2: Know the data model and create a mapping
The Scaffolding
Part 3: Creating the CMDB application
The Bulk of Development
Part 5: Creating the ETL definitions
Some Extras
https://www.servicenow.com/community/cmdb-articles/creating-a-cmdb-integration-video-series/ta-p/2662942