The Migrate Tools module provides tools for running and managing Drupal 8 migrations.

Drush commands supported include:

• migrate-status – Lists migrations and their status.
• migrate-import – Performs import operations.
• migrate-rollback – Performs rollback operations.
• migrate-stop – Cleanly stops a running operation.
• migrate-reset-status – Sets a migration status to Idle if it’s gotten stuck.
• migrate-messages – Lists any messages associated with a migration import.

The UI at this point provides a front-end equivalent to the migrate-status and migrate-messages commands. It will be enhanced to allow running the other operations, as well as provide the ability to create and alter migrations.