Integrations option in the VMware Telco Cloud Service Assurance administration section is used to create a 5G Integration and Smarts Integration.
5G Integration - It is used to configure Virtualized Infrastructure Managers (VIM), Orchestrator, Physical layers, and Kafka Collector and Metrics Mapping.
Smarts Integration - It is used to configure the VMware Telco Cloud Service Assurance to pull the topology and events from Smarts.
NCM Integration - It is used for integrating NCM Reporting feature with VMware Telco Cloud Service Assurance.
For more information on Integrations refer, VMware Telco Cloud Service Assurance Configuration Guide