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The v5 upgrade target can be used to upgrade version 4 data to a changed version 5 layout. For example, it ensures that the interface name is assigned to the plugin instance rather than the type instance and converts the dftype to the df_complex type.
!!! ATTENTION !!! Please note, what df type is used not only by df plugin, but in other plugins too.Memcached plugin still uses df type in new versions, not df_complex, but v5upgrade converts types without checking plugin. So, while using v5upgrade target you will get memcached data storedinto df_complex type RRDs, and after finishing migration and disablingv5upgrade target you will get this data stored as df type again. Please note this, and check for this at other plugins too.