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Node operators should perform two actions: first, announce to the '' mailing list that the node's services will be inaccessible, and summarize the duration and reason for the outage; second, when the node services are to be taken offline, update the node's description document to mark the node state as 'down'. This is accomplished by calling the updateNodeCapabilites() service on the Coordinating Nodes. Once the service outage is over, update the node to the 'up' status using this same service, and announce that the services have been restored to the email list.