About the event that the Node name of SSG / PING changes after CA APIGW version upgrade

Document ID : KB000105972
Last Modified Date : 30/08/2018
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Changed MAC address in API Gateway 9.x
Upgrade API Gatewa to 9.3.
After that the nodes getting renamed to "Gateway1".
CA API Gateway - 9.3
As part of upgrade.sh , node Id gets calculated from mac address. 
Therefore, the node Id itself is different after upgrade. 
This new node Id doesn't exist in the cluster_info table, therefore, a new entry with the default name is created. 
If node Id itself is getting changed then node name can not be persisted as well.

So, the mac address of the node is changed and an upgrade is performed, then the name of the node will change to default name. 
That's an expected behaviour.