Limitations
When linking a Confluence Data Center instance as web page, the migration does not change the link. It still points to the Data Center instance, not to a corresponding Cloud instance. When migrating both, Confluence and Jira, simultaneously, you might have to manually adapt the gadgets pointing to Confluence pages afterwards.
The app migration is currently only supported for Jira 10.
The migration migrates Custom Content gadgets for all dashboards that are mapped to a cloud instance. If a dashboard was migrated as part of an earlier migration and is not migrated again, there could be instances were (duplicated) gadgets are added to these dashboards as part of follow-up migrations.