default or selected kernelversion does not have config value CONFIG_IP_ROUTE_MULTIPATH_RANDOM.
Result is shown for kernelversion 5.4.123

MULTIPATH: random algorithm

modulename: multipath_random.ko

configname: CONFIG_IP_ROUTE_MULTIPATH_RANDOM

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>MULTIPATH: random algorithm
In linux kernel since version 2.6.12  
Multipath routes are chosen in a random fashion. Actually,
there is no weight for a route. The advantage of this policy
is that it is implemented stateless and therefore introduces only
a very small delay.

source code: