Yes, the HANA DB use cases are available in 4.1. Please refer our version wise catalog for details at https://digitate.atlassian.net/wiki/spaces/ID/pages/3776644850 . It is supported for both SUSE and Red Hat (RHEL) Linux flavors. However, the supported version would depend on what AIOps support as OOB.
The use cases are for SAP S/4HANA database. That means, a use case works for HANA DB users. Foe example, users who connect to HANA DB for modelling usage, admin users or business/functional users who execute views based programming.
No. The product currently does not have any capability that directly helps in migration. But the existing capabilities are supported on S/4 HANA and thus can be utilized during migration as well.
Yes, HANA DB monitoring is supported in ignio™ AI.ERPOps Dragon releases and later.