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We recommend to use the latest versions of our apps in both, DC and Cloud, when migrating. But please make sure that the installed apps fulfil the minimum version requirements for the migration.
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For migrating from Jira Data Center 10.3 or higher to Cloud, you require
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at least Version 8.1.0 of the app in Data Center and
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Version 7.0.0 of the app on the Cloud instance.
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The app migration migrates Bar Charts gadgets for all dashboards that are mapped to a Cloud instance. As explained in https://developer.atlassian.com/platform/app-migration/mappings/, Jira stores these mappings for up to two years.
Currently, Jira Cloud Migration Assistant (JCMA) has no way to distinguish whether a dashboard is part of the current migration or the dashboard was only migrated as part of an earlier migration. As a result, the gadgets on dashboards that were part of earlier migrations might be overwritten or the app migration might show an error if such a dashboard has been deleted in the meantime. We reported this limitation to Atlassian (https://jira.atlassian.com/browse/MIG-2567) and want to fix this issue as soon as JCMA has a way to distinguish data mappings for earlier migrations.