OCI-16658
Cause
The fast-start failover configuration was currently unobserved and so failover was not possible.
Action
Ensure that the observer is running and has connectivity to both the primary and the target standby databases. If the primary is not available and failover must be performed, then disable fast-start failover to perform a failover in the absence of the observer process.
If both primary and standby databases are available, and only one observer is registered, restart that observer. If it cannot be restarted, then use the DGMGRL CLI STOP OBSERVER command to deregister that observer and then start a new observer using the DGMGRL START OBSERVER command.
If multiple observers are registered, this error will be temporary since the broker will select a new observer to be the primary observer from the set of observers that have been registered.