Durign the development of SERVER-82707, it has been observed that upon a restart of a mongod node, the ClusterServerParameterOpObserver may send out update notifications about new cluster parameter values as part of the initial sync routine. This should be avoided, since:

• there is no guarantee at this stage that the subscribers have been already initialized (and have the capability of receiving & applying the updates)
• stable values will be also notified by the ClusterServerParameterInitializer once the initial sync is over.