ms/icf_info_server is a SAP Parameter attribute which is used to control name of the application to load icf information for loadbalancing information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Application server from which ICF information is to be retrieved for
load distribution.
Since the message server retrieves information using HTTP, this server
must also offer HTTP as a service, otherwise the data for load
distribution and for deciding whether the request is for the ABAP
runtime environment (BSP) or for SAP J2EE Engine cannot be located.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.