Thanks for sharing the output. Yes, that's exactly what I meant (REST API call to get the ATS instances registered with Ambari). To delete the bad ATS instance from Ambari, you can issue the following API call: curl -u admin:admin -k -H "X-Requested-By: ambari" -X DELETE https://localhost:8443/api/v1/clusters/ROGERGPFS/hosts/<hostname-with-bad-ATS>/host_components/APP_TIMELINE_SERVER
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