long getDeadlineTimePointMs() {
        return deadlineTimePointMs;
    }
Wrapper for a remote (i.e. REST API) cluster controller task whose
completion depends on side effects by the task becoming visible in
the cluster before a response can be sent. Each such task is associated
with a particular cluster state version number representing a lower bound
on the published state containing the side effect. Each task is also
associated with a completion deadline.
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/VersionDependentTaskCompletion.java