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Emit a "vm.migration-memory-iteration" event after every precopy memory iteration to allow management software to observe forward progress during migration. This event is primarily intended for integration with management software such as libvirt, where it maps to VIR_DOMAIN_EVENT_ID_MIGRATION_ITERATION. The event is intentionally independent of any upcoming migration metrics endpoint. Detailed migration statistics will be exposed via that endpoint, while this event provides a lightweight progress signal expected by external management layers. With this event, management software can detect forward progress during migration without being blocked on any upcoming migration metrics endpoint. Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de> On-behalf-of: SAP philipp.schuster@sap.com