In 19c GI environment, TNS-01189 is still being received hourly from OEM 13cR3 for both local listeners and SCAN listeners, though Oracle said this issue has been fixed since 126.96.36.199.
The OEM alert:
Host=racnode2.virtuallab Target type=Listener Target name=LISTENER_SCAN1_racnode-cluster Message=TNS-1189. Please check log for details. Severity=Critical Event reported time=May 1, 2020 9:26:35 PM Operating System=Linux Platform=x86_64 Associated Incident Id=1513 Associated Incident Status=New Associated Incident Owner= Associated Incident Acknowledged By Owner=No Associated Incident Priority=None Associated Incident Escalation Level=0 Event Type=Metric Alert Event name=TNS_ERRORS:tnserrmsg Total Occurrences=115 Occurrences in this event=45 First Occurred in this event=Apr 28, 2020 10:11:23 AM Last Occurred in this event=May 1, 2020 8:10:06 PM Metric Group=TNS Errors Metric=TNSMsg Metric value=TNS-1189(version) Key Value=TNS-1189 Key Column 1=TNSError Rule Name=Incident management rule set for all targets,Create incident for critical metric alerts Rule Owner=System Generated Update Details: TNS-1189. Please check log for details.
The local listener and scan listeners error log:
1-MAY-2020 19:10:35 * (CONNECT_DATA=(COMMAND=version)) * version * 1189 TNS-01189: The listener could not authenticate the user
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