etcd3 API - v2.0.0
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    Interface IDowngradeRequest

    interface IDowngradeRequest {
        action?: DowngradeAction | "Validate" | "Enable" | "Cancel";
        version?: string;
    }
    Index
    action?: DowngradeAction | "Validate" | "Enable" | "Cancel"

    action is the kind of downgrade request to issue. The action may VALIDATE the target version, DOWNGRADE the cluster version, or CANCEL the current downgrading job.

    version?: string

    version is the target version to downgrade.