Unravel needs to be able to connect to your Hive Metastore to populate the Reports > Data Insights page by analyzing your table usage in conjunction with Hive query information and then

Unravel Server collects information through the Hive API, which is similar to the beeline CLI and uses the JDBC database connection protocol.

Populating the Unravel Data page takes you through the steps of connecting Unravel to the Hive Metastore. If you are using Oracle you also have to configure it to grant Unravel access.