Yes. The KernelCare key can be used to deploy and register multiple servers at one time.
KernelCare is often deployed on a large number of servers so adding these servers one by one would be a problem. In this case, the KernelCare key can be used to deploy and register multiple servers at one time.
Registration is always easy:
$ kcarectl --register YOUR_KEY
The key can be obtained from CLN (see image above).
The same key can be used for all servers. You can also partition the servers into groups (one group per key). Such partitioning is convenient for monitoring because you can monitor each group separately using Zabbix or Nagios.
Of course, you can always unregister the server by running:
$ kcarectl --unregister