Solution
If the fully qualified domain name of an agent changes in SteelCentral AppInternals 10.x then Analysis server will see this is a new agent and will collect data under the new agent name. The old data will be still linked to old agent name and there is currently no way to link the data under the new name.
An IP change will not effect the data collection or discovering the agent as a new agent. You can change the IP of the agent and with a Dynamic Sampling Agent restart, Analysis server should be able to pick the new IP and continue collecting data for the agent.
*If you run into any issues please open a technical support case