public boolean suspended(Node node) {
        try {
            return orchestrator.getNodeStatus(new HostName(node.hostname())).isSuspended();
        } catch (HostNameNotFoundException e) {
            // Treat it as not suspended
            return false;
        }
    }
Performs an operation requiring locking on all given nodes.

@param action the action to perform
@return the set of nodes on which the action was performed, as they became as a result of the operation
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/node/Nodes.java