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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
// The description package defines the structure and representation and
// serialisation of models to facilitate the import and export of
// models from different controllers.
package description
// NOTES:
//
// The following prechecks are to be made before attempting migration:
//
// - no agents in an error state
// - nothing dying or dead; machine, application, unit, relation, storage, network etc
// - no entries in the assignUnitC collection
// - these are units pending assignment
// - no units agent status in an error state
// - workload error status is probably fine
// - all units using the same charm and series as the application
// - no units with pending charm updates
// - all units have ResolvedNone for resolved status
// - no pending hook execution
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