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// WatchAllContainers returns a StringsWatcher that notifies of changes to the
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// lifecycles of all containers on a machine.
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func (m *Machine) WatchAllContainers() StringsWatcher {
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isChild := fmt.Sprintf("^%s/%s/%s$", m.doc.Id, names.ContainerTypeSnippet, names.NumberSnippet)
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return m.containersWatcher(isChild)