Duplicate "Client Name" or "Host Name"? Host name might occur if there was a previous installation of a Splunk Universal Forwarder on the system checking into the Deployment Server and it got reinstalled without reloading the deployment server. This would cause a duplicate since the new installation would have a different GUID.
Client Name is defined in deploymentclient.conf under the attribute clientName. It's default is "deploymentClient'. It can be customized to your needs for filtering in Server Classes in Forwarder Management. It isn't necessarily a bad thing to have duplicate values for this and can be used to create forwarder groups to filter on. It could be possible you have an add-on deployed to multiple clients that has this defined as well. The best way to find where this is configured on each system is to run:
splunk btool deploymentclient list --debug
You can change the value as necessary. If it is still in default you'll want to create the file in local rather than changing in default.
