New returns a new Node.

NewHistory returns a new NodeHistory, defaulting Status to "NotObserved".

NotObserved is the default status, used when a reboot command has just been issued.

ObservedOffline means the machine is still seen as offline after a reboot command.

ObservedOnline means the machine was seen online during the last run.

History holds the last reboot of a Node and the status.

Node represents a machine on M-Lab's infrastructure.

NodeStatus is an alias for uint8, used for readability.