itsp/cachecontrol/maxage is a SAP Parameter attribute which is used to control Integrated ITS, max-age for its mimes 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 .
This parameter sets the cache control specification for the MIMES of all
ITS-based services. (Example: cache-control: max-age=<(><<)>paramvalue>)
The cache retention period applies for all MIMES that are stored with
the access path /sap/public/bc/its/mimes.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.