Which aspect must be unique when installing multiple MID servers?

When installing multiple MID servers, the aspect that must be unique is the wrapper name. The MID server uses the wrapper name to identify itself to the ServiceNow instance, and each MID server instance must have a distinct identifier to avoid conflicts in operation. The wrapper name essentially serves as the unique identifier for the MID server within the overall system architecture. If two MID servers were to have the same wrapper name, it would lead to confusion and miscommunication between the servers and the ServiceNow instance, potentially disrupting Discovery processes.

In this context, while the wrapper display name, server ID, and host name are important for identification and management purposes, they do not require uniqueness in the same way as the wrapper name does. For instance, multiple MID servers can have the same display name or different server IDs and host names, but the wrapper name must be unique to ensure that the MID servers can function correctly and communicate effectively within the ServiceNow environment.