The property "glide.discovery.use_cmdb_identifiers" is not present in the sys_properties table. This property is to be manually added if the instance was upgraded from a pre-Geneva version. Once it is manually added the property is not visible under Discovery Definition > Properties
1. Once the "glide.discovery.use_cmdb_identifiers" property is manually created in the sys_properties table with value as true similar to in link below:
2. Under related tab "categories", add discovery.
3. On Discovery Definition>Properties page, search for keyword that you have entered in description field while creating the property in step 1.