Service Mapping is very important for the CMDB. Configuration Management needs to understand the business value of the infrastructure components in the CMDB. The fastest, easiest way to map application services is with Tag Based Service Mapping. This involves leveraging the tags that are put on resources (usually cloud resources) when they are created. In the ServiceNow CMDB, the tags are stored in a table called cmdb_key_value and this table is automatically populated when the CMDB is populated via ServiceNow Discovery or via Service Graph Connectors.
Many Service Maps may have been mapped using Top-Down Service Mapping. Sometimes, a user decides they no longer want to use this mechanism to map the application and want to leverage tags. If so, then they need to convert the application service. The instructions in this guide can be used to convert an Application Service so that it can be mapped with a different mechanism.
1. Import update set: Convert_TD_populate_with_CSDM.xml. Preview and commit this Update Set
2. When you open any Application Service Map that is mapped for Top-Down Service Mapping, in the Form View, you will find a new related link “Convert to CSDM Application Service”.
3. If you click that link, the class of the Service Map will change to cmdb_ci_service_auto and the entry points will be removed.
4. You can now go to CSDM -> Application Service and open the Application Service. Open the Application Service.
5. You will find an entry in the “Comments” with a URL link to csdm_app_service.do. Paste this link into your browser. You will be placed in the Wizard to update and populate the Application Service. At this point, you will be able to populate this Application Service with tags.
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