When you add a data source in vRealize Network Insight, all the certificates (HTTPs certificates or SSH public keys) related to that data source are automatically added as a trust on first use. After you add the data source in vRealize Network Insight, every time there is any change in the certificate, the system validates the certificate.
There are two ways you can configure certificate validation: Automatic Acceptance and Manual Acceptance. In Automatic Acceptance, system automatically accepts all the detected certificate changes, and in Manual Acceptance, system stops the data source and shows you an alert message notification to accept the certificate manually. When you accept the certificate, the system starts the data source.