default or selected kernelversion does not have config value CONFIG_NFSD_LEGACY_CLIENT_TRACKING.
Result is shown for kernelversion 6.8-rc6

Support legacy NFSv4 client tracking methods (DEPRECATED)


Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>Support legacy NFSv4 client tracking methods (DEPRECATED)
The NFSv4 server needs to store a small amount of information on
stable storage in order to handle state recovery after reboot. Most
modern deployments upcall to a userland daemon for this (nfsdcld),
but older NFS servers may store information directly in a
recoverydir, or spawn a process directly using a usermodehelper

These legacy client tracking methods have proven to be probelmatic
and will be removed in the future. Say Y here if you need support
for them in the interim.