ORA-16820: fast-start failover observer is no longer observing this database
Cause: A previously started observer was no longer actively observing this database. A significant amount of time elapsed since this database last heard from the observer. Possible reasons were:

- The host where the observer was running was not available.

- The network connection between the observer and this database was not available.

- The observer process was terminated unexpectedly.
Action: Check the reason why the observer cannot contact this database. If the problem cannot be corrected, stop the current observer by connecting to the Data Guard configuration and issue the DGMGRL STOP OBSERVER command. Then, restart the observer on another host. Finally, use the DGMGRL START OBSERVER command to start the observer on the other host.
ORA-16821
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ORA-16820fast-start failover observer is no longer observing this database